172118173440 has 72 divisors (see below), whose sum is σ = 549702428688. Its totient is φ = 45898178560.

The previous prime is 172118173421. The next prime is 172118173457. The reversal of 172118173440 is 44371811271.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22407381 + ... + 22415060.

It is an arithmetic number, because the mean of its divisors is an integer number (7634755954).

Almost surely, 2^172118173440 is an apocalyptic number.

172118173440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

172118173440 is an abundant number, since it is smaller than the sum of its proper divisors (377584255248).

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

172118173440 is an equidigital number, since it uses as much as digits as its factorization.

172118173440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44822465 (or 44822451 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 39.

The spelling of 172118173440 in words is "one hundred seventy-two billion, one hundred eighteen million, one hundred seventy-three thousand, four hundred forty".