25644670660 has 48 divisors (see below), whose sum is σ = 61556987520. Its totient is φ = 8791061760.

The previous prime is 25644670631. The next prime is 25644670703. The reversal of 25644670660 is 6607644652.

It is a self number, because there is not a number n which added to its sum of digits gives 25644670660.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1279315 + ... + 1299205.

It is an arithmetic number, because the mean of its divisors is an integer number (1282437240).

Almost surely, 2^25644670660 is an apocalyptic number.

25644670660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25644670660 is an abundant number, since it is smaller than the sum of its proper divisors (35912316860).

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

25644670660 is a wasteful number, since it uses less digits than its factorization.

25644670660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29116 (or 29114 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 46.

The spelling of 25644670660 in words is "twenty-five billion, six hundred forty-four million, six hundred seventy thousand, six hundred sixty".