161157172170 has 32 divisors (see below), whose sum is σ = 407133910080. Its totient is φ = 40713390720.

The previous prime is 161157172153. The next prime is 161157172171. The reversal of 161157172170 is 71271751161.

It is not an unprimeable number, because it can be changed into a prime (161157172171) 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, 141365371 + ... + 141366510.

It is an arithmetic number, because the mean of its divisors is an integer number (12722934690).

Almost surely, 2^161157172170 is an apocalyptic number.

161157172170 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161157172170 is an abundant number, since it is smaller than the sum of its proper divisors (245976737910).

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

161157172170 is a wasteful number, since it uses less digits than its factorization.

161157172170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282731910.

The product of its (nonzero) digits is 20580, while the sum is 39.

The spelling of 161157172170 in words is "one hundred sixty-one billion, one hundred fifty-seven million, one hundred seventy-two thousand, one hundred seventy".