25528403261640 has 64 divisors (see below), whose sum is σ = 76587169766400. Its totient is φ = 6807399982592.

The previous prime is 25528403261611. The next prime is 25528403261681. The reversal of 25528403261640 is 4616230482552.

It is a self number, because there is not a number n which added to its sum of digits gives 25528403261640.

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, 2020564 + ... + 7425596.

It is an arithmetic number, because the mean of its divisors is an integer number (1196674527600).

Almost surely, 2^{25528403261640} is an apocalyptic number.

25528403261640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25528403261640 is an abundant number, since it is smaller than the sum of its proper divisors (51058766504760).

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

25528403261640 is a wasteful number, since it uses less digits than its factorization.

25528403261640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5444406 (or 5444402 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 48.

The spelling of 25528403261640 in words is "twenty-five trillion, five hundred twenty-eight billion, four hundred three million, two hundred sixty-one thousand, six hundred forty".