172507512220 has 12 divisors (see below), whose sum is σ = 362265775704. Its totient is φ = 69003004880.

The previous prime is 172507512173. The next prime is 172507512227. The reversal of 172507512220 is 22215705271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172507512227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4312687786 + ... + 4312687825.

It is an arithmetic number, because the mean of its divisors is an integer number (30188814642).

Almost surely, 2^172507512220 is an apocalyptic number.

172507512220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172507512220 is an abundant number, since it is smaller than the sum of its proper divisors (189758263484).

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

172507512220 is a wasteful number, since it uses less digits than its factorization.

172507512220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8625375620 (or 8625375618 counting only the distinct ones).

The product of its (nonzero) digits is 19600, while the sum is 34.

The spelling of 172507512220 in words is "one hundred seventy-two billion, five hundred seven million, five hundred twelve thousand, two hundred twenty".