25045312631 has 4 divisors (see below), whose sum is σ = 26363487000. Its totient is φ = 23727138264.

The previous prime is 25045312627. The next prime is 25045312681. The reversal of 25045312631 is 13621354052.

It is a happy number.

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 25045312631 - 2² = 25045312627 is a prime.

It is a super-2 number, since 2×25045312631² (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 (25045312681) 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, 659087156 + ... + 659087193.

It is an arithmetic number, because the mean of its divisors is an integer number (6590871750).

Almost surely, 2^25045312631 is an apocalyptic number.

25045312631 is a deficient number, since it is larger than the sum of its proper divisors (1318174369).

25045312631 is a wasteful number, since it uses less digits than its factorization.

25045312631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1318174368.

The product of its (nonzero) digits is 21600, while the sum is 32.

Adding to 25045312631 its reverse (13621354052), we get a palindrome (38666666683).

It can be divided in two parts, 2504 and 5312631, that added together give a palindrome (5315135).

The spelling of 25045312631 in words is "twenty-five billion, forty-five million, three hundred twelve thousand, six hundred thirty-one".