172170870651 has 32 divisors (see below), whose sum is σ = 276532200000. Its totient is φ = 105240190464.

The previous prime is 172170870589. The next prime is 172170870659. The reversal of 172170870651 is 156078071271.

It is not a de Polignac number, because 172170870651 - 2²¹ = 172168773499 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 172170870597 and 172170870606.

It is not an unprimeable number, because it can be changed into a prime (172170870659) 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 31 ways as a sum of consecutive naturals, for example, 1593726 + ... + 1698323.

It is an arithmetic number, because the mean of its divisors is an integer number (8641631250).

Almost surely, 2^172170870651 is an apocalyptic number.

172170870651 is a deficient number, since it is larger than the sum of its proper divisors (104361329349).

172170870651 is a wasteful number, since it uses less digits than its factorization.

172170870651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3292220 (or 3292214 counting only the distinct ones).

The product of its (nonzero) digits is 164640, while the sum is 45.

The spelling of 172170870651 in words is "one hundred seventy-two billion, one hundred seventy million, eight hundred seventy thousand, six hundred fifty-one".