25631616512 has 40 divisors (see below), whose sum is σ = 53908621800. Its totient is φ = 12141287424.

The previous prime is 25631616511. The next prime is 25631616523. The reversal of 25631616512 is 21561613652.

It is a super-2 number, since 2×25631616512² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25631616511) 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, 1307687 + ... + 1327142.

It is an arithmetic number, because the mean of its divisors is an integer number (1347715545).

Almost surely, 2^25631616512 is an apocalyptic number.

It is an amenable number.

25631616512 is an abundant number, since it is smaller than the sum of its proper divisors (28277005288).

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

25631616512 is an equidigital number, since it uses as much as digits as its factorization.

25631616512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2634866 (or 2634850 counting only the distinct ones).

The product of its digits is 64800, while the sum is 38.

The spelling of 25631616512 in words is "twenty-five billion, six hundred thirty-one million, six hundred sixteen thousand, five hundred twelve".