225561256122520 has 32 divisors (see below), whose sum is σ = 534224027660400. Its totient is φ = 85475844425088.

The previous prime is 225561256122497. The next prime is 225561256122551. The reversal of 225561256122520 is 25221652165522.

It is a congruent number.

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, 148395562479 + ... + 148395563998.

Almost surely, 2^{225561256122520} is an apocalyptic number.

225561256122520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

225561256122520 is an abundant number, since it is smaller than the sum of its proper divisors (308662771537880).

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

225561256122520 is a wasteful number, since it uses less digits than its factorization.

225561256122520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296791126507 (or 296791126503 counting only the distinct ones).

The product of its (nonzero) digits is 1440000, while the sum is 46.

The spelling of 225561256122520 in words is "two hundred twenty-five trillion, five hundred sixty-one billion, two hundred fifty-six million, one hundred twenty-two thousand, five hundred twenty".