25121923812 has 36 divisors (see below), whose sum is σ = 63514026576. Its totient is φ = 8372473200.

The previous prime is 25121923793. The next prime is 25121923817. The reversal of 25121923812 is 21832912152.

25121923812 is a `hidden beast` number, since 251 + 21 + 9 + 2 + 381 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×25121923812² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (25121923817) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 151003 + ... + 270269.

It is an arithmetic number, because the mean of its divisors is an integer number (1764278516).

Almost surely, 2^25121923812 is an apocalyptic number.

It is an amenable number.

25121923812 is an abundant number, since it is smaller than the sum of its proper divisors (38392102764).

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

25121923812 is a wasteful number, since it uses less digits than its factorization.

25121923812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125128 (or 125123 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The spelling of 25121923812 in words is "twenty-five billion, one hundred twenty-one million, nine hundred twenty-three thousand, eight hundred twelve".