161159721579 has 8 divisors (see below), whose sum is σ = 238755143120. Its totient is φ = 107439814368.

The previous prime is 161159721563. The next prime is 161159721599. The reversal of 161159721579 is 975127951161.

161159721579 is a `hidden beast` number, since 1 + 6 + 11 + 59 + 7 + 2 + 1 + 579 = 666.

It is not a de Polignac number, because 161159721579 - 2⁴ = 161159721563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161159721559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2984439262 + ... + 2984439315.

It is an arithmetic number, because the mean of its divisors is an integer number (29844392890).

Almost surely, 2^161159721579 is an apocalyptic number.

161159721579 is a deficient number, since it is larger than the sum of its proper divisors (77595421541).

161159721579 is an equidigital number, since it uses as much as digits as its factorization.

161159721579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5968878586 (or 5968878580 counting only the distinct ones).

The product of its digits is 1190700, while the sum is 54.

The spelling of 161159721579 in words is "one hundred sixty-one billion, one hundred fifty-nine million, seven hundred twenty-one thousand, five hundred seventy-nine".