25197590561 has 24 divisors (see below), whose sum is σ = 30327146496. Its totient is φ = 20745791040.

The previous prime is 25197590549. The next prime is 25197590581. The reversal of 25197590561 is 16509579152.

It is not a de Polignac number, because 25197590561 - 2³⁴ = 8017721377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25197590521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29345 + ... + 226398.

It is an arithmetic number, because the mean of its divisors is an integer number (1263631104).

Almost surely, 2^25197590561 is an apocalyptic number.

It is an amenable number.

25197590561 is a deficient number, since it is larger than the sum of its proper divisors (5129555935).

25197590561 is a wasteful number, since it uses less digits than its factorization.

25197590561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255833 (or 255820 counting only the distinct ones).

The product of its (nonzero) digits is 850500, while the sum is 50.

The spelling of 25197590561 in words is "twenty-five billion, one hundred ninety-seven million, five hundred ninety thousand, five hundred sixty-one".