161779376165 has 16 divisors (see below), whose sum is σ = 213840072576. Its totient is φ = 116515416000.

The previous prime is 161779376153. The next prime is 161779376167. The reversal of 161779376165 is 561673977161.

It is a de Polignac number, because none of the positive numbers 2^k-161779376165 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161779376167) 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, 14273186 + ... + 14284515.

It is an arithmetic number, because the mean of its divisors is an integer number (13365004536).

Almost surely, 2^161779376165 is an apocalyptic number.

It is an amenable number.

161779376165 is a deficient number, since it is larger than the sum of its proper divisors (52060696411).

161779376165 is a wasteful number, since it uses less digits than its factorization.

161779376165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28557820.

The product of its digits is 10001880, while the sum is 59.

The spelling of 161779376165 in words is "one hundred sixty-one billion, seven hundred seventy-nine million, three hundred seventy-six thousand, one hundred sixty-five".