161994236416 has 40 divisors (see below), whose sum is σ = 329158106640. Its totient is φ = 79624270848.

The previous prime is 161994236413. The next prime is 161994236473. The reversal of 161994236416 is 614632499161.

It is not an unprimeable number, because it can be changed into a prime (161994236413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2651106 + ... + 2711521.

It is an arithmetic number, because the mean of its divisors is an integer number (8228952666).

Almost surely, 2^161994236416 is an apocalyptic number.

161994236416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161994236416 is an abundant number, since it is smaller than the sum of its proper divisors (167163870224).

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

161994236416 is an frugal number, since it uses more digits than its factorization.

161994236416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5362704 (or 5362688 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 52.

The spelling of 161994236416 in words is "one hundred sixty-one billion, nine hundred ninety-four million, two hundred thirty-six thousand, four hundred sixteen".