170879921556399 has 24 divisors (see below), whose sum is σ = 269277572034432. Its totient is φ = 103558880707920.

The previous prime is 170879921556391. The next prime is 170879921556413. The reversal of 170879921556399 is 993655129978071.

170879921556399 is a `hidden beast` number, since 1 + 7 + 0 + 8 + 7 + 9 + 9 + 21 + 556 + 39 + 9 = 666.

It is not a de Polignac number, because 170879921556399 - 2³ = 170879921556391 is a prime.

It is a super-2 number, since 2×170879921556399² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (170879921556391) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 37044987 + ... + 41401580.

It is an arithmetic number, because the mean of its divisors is an integer number (11219898834768).

Almost surely, 2^{170879921556399} is an apocalyptic number.

170879921556399 is a deficient number, since it is larger than the sum of its proper divisors (98397650478033).

170879921556399 is a wasteful number, since it uses less digits than its factorization.

170879921556399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78468587 (or 78468584 counting only the distinct ones).

The product of its (nonzero) digits is 2314720800, while the sum is 81.

The spelling of 170879921556399 in words is "one hundred seventy trillion, eight hundred seventy-nine billion, nine hundred twenty-one million, five hundred fifty-six thousand, three hundred ninety-nine".