25315851020 has 24 divisors (see below), whose sum is σ = 54996505200. Its totient is φ = 9777156032.

The previous prime is 25315851017. The next prime is 25315851031. The reversal of 25315851020 is 2015851352.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21823430 + ... + 21824589.

It is an arithmetic number, because the mean of its divisors is an integer number (2291521050).

Almost surely, 2^25315851020 is an apocalyptic number.

25315851020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25315851020 is an abundant number, since it is smaller than the sum of its proper divisors (29680654180).

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

25315851020 is a wasteful number, since it uses less digits than its factorization.

25315851020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43648057 (or 43648055 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 32.

The spelling of 25315851020 in words is "twenty-five billion, three hundred fifteen million, eight hundred fifty-one thousand, twenty".