225128820172 has 24 divisors (see below), whose sum is σ = 400496109552. Its totient is φ = 110716569600.

The previous prime is 225128820157. The next prime is 225128820181. The reversal of 225128820172 is 271028821522.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1841829 + ... + 1960252.

It is an arithmetic number, because the mean of its divisors is an integer number (16687337898).

Almost surely, 2^225128820172 is an apocalyptic number.

It is an amenable number.

225128820172 is a deficient number, since it is larger than the sum of its proper divisors (175367289380).

225128820172 is a wasteful number, since it uses less digits than its factorization.

225128820172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3802329 (or 3802327 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 40.

The spelling of 225128820172 in words is "two hundred twenty-five billion, one hundred twenty-eight million, eight hundred twenty thousand, one hundred seventy-two".