161918294592 has 56 divisors (see below), whose sum is σ = 435431948032. Its totient is φ = 53087961600.

The previous prime is 161918294513. The next prime is 161918294597. The reversal of 161918294592 is 295492819161.

It is not an unprimeable number, because it can be changed into a prime (161918294597) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6900784 + ... + 6924207.

Almost surely, 2^161918294592 is an apocalyptic number.

161918294592 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161918294592 is an abundant number, since it is smaller than the sum of its proper divisors (273513653440).

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

161918294592 is a wasteful number, since it uses less digits than its factorization.

161918294592 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13825067 (or 13825057 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 57.

The spelling of 161918294592 in words is "one hundred sixty-one billion, nine hundred eighteen million, two hundred ninety-four thousand, five hundred ninety-two".