25105672521 has 16 divisors (see below), whose sum is σ = 37277565120. Its totient is φ = 16699325760.

The previous prime is 25105672499. The next prime is 25105672523. The reversal of 25105672521 is 12527650152.

25105672521 is a `hidden beast` number, since 2 + 5 + 10 + 56 + 72 + 521 = 666.

It is not a de Polignac number, because 25105672521 - 2¹⁵ = 25105639753 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25105672523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1037520 + ... + 1061441.

It is an arithmetic number, because the mean of its divisors is an integer number (2329847820).

Almost surely, 2^25105672521 is an apocalyptic number.

It is an amenable number.

25105672521 is a deficient number, since it is larger than the sum of its proper divisors (12171892599).

25105672521 is a wasteful number, since it uses less digits than its factorization.

25105672521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2099413 (or 2099407 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 36.

The spelling of 25105672521 in words is "twenty-five billion, one hundred five million, six hundred seventy-two thousand, five hundred twenty-one".