25431999992 has 24 divisors (see below), whose sum is σ = 55470306960. Its totient is φ = 10899428400.

The previous prime is 25431999979. The next prime is 25431999997. The reversal of 25431999992 is 29999913452.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25431999997) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 32438384 + ... + 32439167.

It is an arithmetic number, because the mean of its divisors is an integer number (2311262790).

Almost surely, 2^25431999992 is an apocalyptic number.

It is an amenable number.

25431999992 is an abundant number, since it is smaller than the sum of its proper divisors (30038306968).

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

25431999992 is a wasteful number, since it uses less digits than its factorization.

25431999992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64877571 (or 64877560 counting only the distinct ones).

The product of its digits is 14171760, while the sum is 62.

The spelling of 25431999992 in words is "twenty-five billion, four hundred thirty-one million, nine hundred ninety-nine thousand, nine hundred ninety-two".