225720764172 has 72 divisors (see below), whose sum is σ = 584589882240. Its totient is φ = 73392372480.

The previous prime is 225720764081. The next prime is 225720764207. The reversal of 225720764172 is 271467027522.

225720764172 is a `hidden beast` number, since 2 + 2 + 572 + 0 + 7 + 6 + 4 + 1 + 72 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12432133 + ... + 12450275.

It is an arithmetic number, because the mean of its divisors is an integer number (8119303920).

Almost surely, 2^225720764172 is an apocalyptic number.

It is an amenable number.

225720764172 is an abundant number, since it is smaller than the sum of its proper divisors (358869118068).

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

225720764172 is a wasteful number, since it uses less digits than its factorization.

225720764172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26623 (or 26618 counting only the distinct ones).

The product of its (nonzero) digits is 658560, while the sum is 45.

The spelling of 225720764172 in words is "two hundred twenty-five billion, seven hundred twenty million, seven hundred sixty-four thousand, one hundred seventy-two".