171953918920 has 64 divisors (see below), whose sum is σ = 457414387200. Its totient is φ = 56922673920.

The previous prime is 171953918837. The next prime is 171953918923. The reversal of 171953918920 is 29819359171.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (171953918923) 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, 10580176 + ... + 10596415.

It is an arithmetic number, because the mean of its divisors is an integer number (7147099800).

Almost surely, 2^171953918920 is an apocalyptic number.

171953918920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

171953918920 is an abundant number, since it is smaller than the sum of its proper divisors (285460468280).

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

171953918920 is a wasteful number, since it uses less digits than its factorization.

171953918920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21176638 (or 21176634 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 55.

The spelling of 171953918920 in words is "one hundred seventy-one billion, nine hundred fifty-three million, nine hundred eighteen thousand, nine hundred twenty".