25638818604 has 36 divisors (see below), whose sum is σ = 69591080664. Its totient is φ = 7325376576.

The previous prime is 25638818581. The next prime is 25638818609. The reversal of 25638818604 is 40681883652.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (25638818609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21801129 + ... + 21802304.

It is an arithmetic number, because the mean of its divisors is an integer number (1933085574).

Almost surely, 2^25638818604 is an apocalyptic number.

It is an amenable number.

25638818604 is an abundant number, since it is smaller than the sum of its proper divisors (43952262060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25638818604 is a wasteful number, since it uses less digits than its factorization.

25638818604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43603454 (or 43603445 counting only the distinct ones).

The product of its (nonzero) digits is 2211840, while the sum is 51.

The spelling of 25638818604 in words is "twenty-five billion, six hundred thirty-eight million, eight hundred eighteen thousand, six hundred four".