/**
 * Converts a large number into a human-readable string representation with SI unit prefixes (K, M, B, T, P, E).
 *
 * This function takes a large number as input and converts it into a human-readable string representation using SI unit prefixes
 * (K for thousand, M for million, B for billion, T for trillion, P for quadrillion, E for quintillion, etc.).
 * It checks the magnitude of the input number and selects the appropriate SI unit,
 * then formats the number with two decimal places and appends the corresponding SI unit symbol to create the readable string.
 *
 * @param {number} n - The number to be converted.
 * @returns {string} - A human-readable string representation of the number with SI unit prefixes.
 */
export declare function stringifyBigNumber(n: number): string | number;