25426440631 has 4 divisors (see below), whose sum is σ = 25426812064. Its totient is φ = 25426069200.

The previous prime is 25426440619. The next prime is 25426440647. The reversal of 25426440631 is 13604462452.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 25426440631 - 2¹⁵ = 25426407863 is a prime.

It is a super-2 number, since 2×25426440631² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25426440601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49950 + ... + 230971.

It is an arithmetic number, because the mean of its divisors is an integer number (6356703016).

Almost surely, 2^25426440631 is an apocalyptic number.

25426440631 is a deficient number, since it is larger than the sum of its proper divisors (371433).

25426440631 is an equidigital number, since it uses as much as digits as its factorization.

25426440631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371432.

The product of its (nonzero) digits is 138240, while the sum is 37.

The spelling of 25426440631 in words is "twenty-five billion, four hundred twenty-six million, four hundred forty thousand, six hundred thirty-one".