25425991992 has 32 divisors (see below), whose sum is σ = 63920102400. Its totient is φ = 8427981024.

The previous prime is 25425991933. The next prime is 25425992029. The reversal of 25425991992 is 29919952452.

It is a congruent number.

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, 2954968 + ... + 2963559.

It is an arithmetic number, because the mean of its divisors is an integer number (1997503200).

Almost surely, 2^25425991992 is an apocalyptic number.

It is an amenable number.

25425991992 is an abundant number, since it is smaller than the sum of its proper divisors (38494110408).

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

25425991992 is a wasteful number, since it uses less digits than its factorization.

25425991992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5918715 (or 5918711 counting only the distinct ones).

The product of its digits is 5248800, while the sum is 57.

The spelling of 25425991992 in words is "twenty-five billion, four hundred twenty-five million, nine hundred ninety-one thousand, nine hundred ninety-two".