171888660728055 has 12 divisors (see below), whose sum is σ = 297940345262040. Its totient is φ = 91673952388272.

The previous prime is 171888660728047. The next prime is 171888660728063. The reversal of 171888660728055 is 550827066888171.

171888660728055 is a `hidden beast` number, since 1 + 7 + 1 + 8 + 8 + 8 + 6 + 607 + 2 + 8 + 0 + 5 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (171888660728047) and next prime (171888660728063).

It is not a de Polignac number, because 171888660728055 - 2³ = 171888660728047 is a prime.

It is a hoax number, since the sum of its digits (72) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1909874008045 + ... + 1909874008134.

It is an arithmetic number, because the mean of its divisors is an integer number (24828362105170).

Almost surely, 2^{171888660728055} is an apocalyptic number.

171888660728055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

171888660728055 is a deficient number, since it is larger than the sum of its proper divisors (126051684533985).

171888660728055 is a wasteful number, since it uses less digits than its factorization.

171888660728055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3819748016190 (or 3819748016187 counting only the distinct ones).

The product of its (nonzero) digits is 361267200, while the sum is 72.

The spelling of 171888660728055 in words is "one hundred seventy-one trillion, eight hundred eighty-eight billion, six hundred sixty million, seven hundred twenty-eight thousand, fifty-five".