25257565838 has 16 divisors (see below), whose sum is σ = 38627987616. Its totient is φ = 12381900960.

The previous prime is 25257565777. The next prime is 25257565843. The reversal of 25257565838 is 83856575252.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72023 + ... + 236013.

It is an arithmetic number, because the mean of its divisors is an integer number (2414249226).

Almost surely, 2^25257565838 is an apocalyptic number.

25257565838 is a deficient number, since it is larger than the sum of its proper divisors (13370421778).

25257565838 is a wasteful number, since it uses less digits than its factorization.

25257565838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165499.

The product of its digits is 20160000, while the sum is 56.

The spelling of 25257565838 in words is "twenty-five billion, two hundred fifty-seven million, five hundred sixty-five thousand, eight hundred thirty-eight".