25856212940 has 24 divisors (see below), whose sum is σ = 55622391552. Its totient is φ = 10090229120.

The previous prime is 25856212937. The next prime is 25856212973. The reversal of 25856212940 is 4921265852.

It is a junction number, because it is equal to n+sod(n) for n = 25856212891 and 25856212900.

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, 15765164 + ... + 15766803.

It is an arithmetic number, because the mean of its divisors is an integer number (2317599648).

Almost surely, 2^25856212940 is an apocalyptic number.

25856212940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25856212940 is an abundant number, since it is smaller than the sum of its proper divisors (29766178612).

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

25856212940 is a wasteful number, since it uses less digits than its factorization.

25856212940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31532017 (or 31532015 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 44.

The spelling of 25856212940 in words is "twenty-five billion, eight hundred fifty-six million, two hundred twelve thousand, nine hundred forty".