25638259972 has 24 divisors (see below), whose sum is σ = 49441943936. Its totient is φ = 11557855008.

The previous prime is 25638259967. The next prime is 25638259979. The reversal of 25638259972 is 27995283652.

It is not an unprimeable number, because it can be changed into a prime (25638259979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5730828 + ... + 5735299.

Almost surely, 2^25638259972 is an apocalyptic number.

It is an amenable number.

25638259972 is a deficient number, since it is larger than the sum of its proper divisors (23803683964).

25638259972 is a wasteful number, since it uses less digits than its factorization.

25638259972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11466187 (or 11466185 counting only the distinct ones).

The product of its digits is 16329600, while the sum is 58.

The spelling of 25638259972 in words is "twenty-five billion, six hundred thirty-eight million, two hundred fifty-nine thousand, nine hundred seventy-two".