25572815858 has 18 divisors (see below), whose sum is σ = 38917014759. Its totient is φ = 12603110112.

The previous prime is 25572815843. The next prime is 25572815861. The reversal of 25572815858 is 85851827552.

It can be written as a sum of positive squares in 5 ways, for example, as 10327234129 + 15245581729 = 101623^2 + 123473^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=113077.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 16508468 + ... + 16510016.

Almost surely, 2^25572815858 is an apocalyptic number.

25572815858 is a deficient number, since it is larger than the sum of its proper divisors (13344198901).

25572815858 is an frugal number, since it uses more digits than its factorization.

25572815858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3246 (or 1624 counting only the distinct ones).

The product of its digits is 8960000, while the sum is 56.

The spelling of 25572815858 in words is "twenty-five billion, five hundred seventy-two million, eight hundred fifteen thousand, eight hundred fifty-eight".