172170368500 has 48 divisors (see below), whose sum is σ = 404944722000. Its totient is φ = 63570595200.

The previous prime is 172170368497. The next prime is 172170368509. The reversal of 172170368500 is 5863071271.

It can be written as a sum of positive squares in 8 ways, for example, as 65911319824 + 106259048676 = 256732^2 + 325974^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172170368509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13237375 + ... + 13250374.

It is an arithmetic number, because the mean of its divisors is an integer number (8436348375).

Almost surely, 2^172170368500 is an apocalyptic number.

172170368500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172170368500 is an abundant number, since it is smaller than the sum of its proper divisors (232774353500).

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

172170368500 is a wasteful number, since it uses less digits than its factorization.

172170368500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26487781 (or 26487769 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 40.

The spelling of 172170368500 in words is "one hundred seventy-two billion, one hundred seventy million, three hundred sixty-eight thousand, five hundred".