8172079929225 has 27 divisors (see below), whose sum is σ = 14637179965863. Its totient is φ = 4358419759440.

The previous prime is 8172079929163. The next prime is 8172079929263. The reversal of 8172079929225 is 5229299702718.

The square root of 8172079929225 is 2858685.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 2941948774521 + 5230131154704 = 1715211^2 + 2286948^2 .

It is a de Polignac number, because none of the positive numbers 2^k-8172079929225 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 42784986 + ... + 42975564.

Almost surely, 2^{8172079929225} is an apocalyptic number.

8172079929225 is the 2858685-th square number.

8172079929225 is the 1429343-rd centered octagonal number.

It is an amenable number.

8172079929225 is a deficient number, since it is larger than the sum of its proper divisors (6465100036638).

8172079929225 is an frugal number, since it uses more digits than its factorization.

8172079929225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 381174 (or 190587 counting only the distinct ones).

The product of its (nonzero) digits is 22861440, while the sum is 63.

The spelling of 8172079929225 in words is "eight trillion, one hundred seventy-two billion, seventy-nine million, nine hundred twenty-nine thousand, two hundred twenty-five".