815172852571625 has 16 divisors (see below), whose sum is σ = 1070879705276160. Its totient is φ = 617815214578800.

The previous prime is 815172852571579. The next prime is 815172852571639. The reversal of 815172852571625 is 526175258271518.

It is not a de Polignac number, because 815172852571625 - 2³⁰ = 815171778829801 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 171615335009 + ... + 171615339758.

It is an arithmetic number, because the mean of its divisors is an integer number (66929981579760).

Almost surely, 2^{815172852571625} is an apocalyptic number.

It is an amenable number.

815172852571625 is a deficient number, since it is larger than the sum of its proper divisors (255706852704535).

815172852571625 is a wasteful number, since it uses less digits than its factorization.

815172852571625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343230674801 (or 343230674791 counting only the distinct ones).

The product of its digits is 94080000, while the sum is 65.

The spelling of 815172852571625 in words is "eight hundred fifteen trillion, one hundred seventy-two billion, eight hundred fifty-two million, five hundred seventy-one thousand, six hundred twenty-five".