2561502172 has 12 divisors (see below), whose sum is σ = 4507672680. Its totient is φ = 1273595696.

The previous prime is 2561502161. The next prime is 2561502187. The reversal of 2561502172 is 2712051652.

It is a super-2 number, since 2×2561502172² = 13122586754321435168, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1788043 + ... + 1789474.

It is an arithmetic number, because the mean of its divisors is an integer number (375639390).

Almost surely, 2^2561502172 is an apocalyptic number.

It is an amenable number.

2561502172 is a deficient number, since it is larger than the sum of its proper divisors (1946170508).

2561502172 is a wasteful number, since it uses less digits than its factorization.

2561502172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3577700 (or 3577698 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 2561502172 is about 50611.2850261678. The cubic root of 2561502172 is about 1368.2482756466.

The spelling of 2561502172 in words is "two billion, five hundred sixty-one million, five hundred two thousand, one hundred seventy-two".