25640128252 has 36 divisors (see below), whose sum is σ = 45505738656. Its totient is φ = 12640819200.

The previous prime is 25640128247. The next prime is 25640128271. The reversal of 25640128252 is 25282104652.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10904877 + ... + 10907227.

It is an arithmetic number, because the mean of its divisors is an integer number (1264048296).

Almost surely, 2^25640128252 is an apocalyptic number.

It is an amenable number.

25640128252 is a deficient number, since it is larger than the sum of its proper divisors (19865610404).

25640128252 is a wasteful number, since it uses less digits than its factorization.

25640128252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2818 (or 2713 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 37.

The spelling of 25640128252 in words is "twenty-five billion, six hundred forty million, one hundred twenty-eight thousand, two hundred fifty-two".