161351233651 has 12 divisors (see below), whose sum is σ = 164341661016. Its totient is φ = 158413993920.

The previous prime is 161351233639. The next prime is 161351233699. The reversal of 161351233651 is 156332153161.

It is not a de Polignac number, because 161351233651 - 2⁵ = 161351233619 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161351233651.

It is not an unprimeable number, because it can be changed into a prime (161351233151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1995751 + ... + 2075023.

It is an arithmetic number, because the mean of its divisors is an integer number (13695138418).

Almost surely, 2^161351233651 is an apocalyptic number.

161351233651 is a deficient number, since it is larger than the sum of its proper divisors (2990427365).

161351233651 is an frugal number, since it uses more digits than its factorization.

161351233651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79942 (or 79881 counting only the distinct ones).

The product of its digits is 48600, while the sum is 37.

The spelling of 161351233651 in words is "one hundred sixty-one billion, three hundred fifty-one million, two hundred thirty-three thousand, six hundred fifty-one".