161420743172 has 24 divisors (see below), whose sum is σ = 320227387200. Its totient is φ = 70580729376.

The previous prime is 161420743073. The next prime is 161420743207. The reversal of 161420743172 is 271347024161.

161420743172 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81689672 + ... + 81691647.

It is an arithmetic number, because the mean of its divisors is an integer number (13342807800).

Almost surely, 2^161420743172 is an apocalyptic number.

It is an amenable number.

161420743172 is a deficient number, since it is larger than the sum of its proper divisors (158806644028).

161420743172 is a wasteful number, since it uses less digits than its factorization.

161420743172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163381355 (or 163381353 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 38.

The spelling of 161420743172 in words is "one hundred sixty-one billion, four hundred twenty million, seven hundred forty-three thousand, one hundred seventy-two".