161718857158 has 8 divisors (see below), whose sum is σ = 242581113720. Its totient is φ = 80858485920.

The previous prime is 161718857149. The next prime is 161718857191. The reversal of 161718857158 is 851758817161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232728 + ... + 614491.

It is an arithmetic number, because the mean of its divisors is an integer number (30322639215).

Almost surely, 2^161718857158 is an apocalyptic number.

161718857158 is a deficient number, since it is larger than the sum of its proper divisors (80862256562).

161718857158 is an equidigital number, since it uses as much as digits as its factorization.

161718857158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 942662.

The product of its digits is 3763200, while the sum is 58.

The spelling of 161718857158 in words is "one hundred sixty-one billion, seven hundred eighteen million, eight hundred fifty-seven thousand, one hundred fifty-eight".