25220613612 has 12 divisors (see below), whose sum is σ = 58848098456. Its totient is φ = 8406871200.

The previous prime is 25220613589. The next prime is 25220613617. The reversal of 25220613612 is 21631602252.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 25220613612.

It is not an unprimeable number, because it can be changed into a prime (25220613617) 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, 1050858889 + ... + 1050858912.

Almost surely, 2^25220613612 is an apocalyptic number.

It is an amenable number.

25220613612 is an abundant number, since it is smaller than the sum of its proper divisors (33627484844).

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

25220613612 is a wasteful number, since it uses less digits than its factorization.

25220613612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2101717808 (or 2101717806 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The spelling of 25220613612 in words is "twenty-five billion, two hundred twenty million, six hundred thirteen thousand, six hundred twelve".