25640128250 has 32 divisors (see below), whose sum is σ = 52361809344. Its totient is φ = 9323682000.

The previous prime is 25640128247. The next prime is 25640128271. The reversal of 25640128250 is 5282104652.

It is a self number, because there is not a number n which added to its sum of digits gives 25640128250.

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, 4659092 + ... + 4664591.

It is an arithmetic number, because the mean of its divisors is an integer number (1636306542).

Almost surely, 2^25640128250 is an apocalyptic number.

25640128250 is an abundant number, since it is smaller than the sum of its proper divisors (26721681094).

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

25640128250 is a wasteful number, since it uses less digits than its factorization.

25640128250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9323711 (or 9323701 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 35.

The spelling of 25640128250 in words is "twenty-five billion, six hundred forty million, one hundred twenty-eight thousand, two hundred fifty".