161992904840 has 64 divisors (see below), whose sum is σ = 413180308800. Its totient is φ = 56664721152.

The previous prime is 161992904837. The next prime is 161992904849. The reversal of 161992904840 is 48409299161.

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (161992904849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8188142 + ... + 8207901.

It is an arithmetic number, because the mean of its divisors is an integer number (6455942325).

Almost surely, 2^161992904840 is an apocalyptic number.

161992904840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161992904840 is an abundant number, since it is smaller than the sum of its proper divisors (251187403960).

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

161992904840 is a wasteful number, since it uses less digits than its factorization.

161992904840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16396086 (or 16396082 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 53.

The spelling of 161992904840 in words is "one hundred sixty-one billion, nine hundred ninety-two million, nine hundred four thousand, eight hundred forty".