225531868572 has 72 divisors (see below), whose sum is σ = 575306602416. Its totient is φ = 74490361344.

The previous prime is 225531868543. The next prime is 225531868579. The reversal of 225531868572 is 275868135522.

It is a happy number.

225531868572 is a `hidden beast` number, since 2 + 2 + 5 + 5 + 3 + 1 + 8 + 68 + 572 = 666.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225531868579) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20281558 + ... + 20292674.

It is an arithmetic number, because the mean of its divisors is an integer number (7990369478).

Almost surely, 2^225531868572 is an apocalyptic number.

It is an amenable number.

225531868572 is an abundant number, since it is smaller than the sum of its proper divisors (349774733844).

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

225531868572 is a wasteful number, since it uses less digits than its factorization.

225531868572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16227 (or 16222 counting only the distinct ones).

The product of its digits is 8064000, while the sum is 54.

The spelling of 225531868572 in words is "two hundred twenty-five billion, five hundred thirty-one million, eight hundred sixty-eight thousand, five hundred seventy-two".