161579508519 has 48 divisors (see below), whose sum is σ = 255230238816. Its totient is φ = 90319975680.

The previous prime is 161579508511. The next prime is 161579508551. The reversal of 161579508519 is 915805975161.

It is not a de Polignac number, because 161579508519 - 2³ = 161579508511 is a prime.

It is a super-2 number, since 2×161579508519² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161579508511) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6012757 + ... + 6039569.

It is an arithmetic number, because the mean of its divisors is an integer number (5317296642).

Almost surely, 2^161579508519 is an apocalyptic number.

161579508519 is a deficient number, since it is larger than the sum of its proper divisors (93650730297).

161579508519 is a wasteful number, since it uses less digits than its factorization.

161579508519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28128 (or 28117 counting only the distinct ones).

The product of its (nonzero) digits is 3402000, while the sum is 57.

The spelling of 161579508519 in words is "one hundred sixty-one billion, five hundred seventy-nine million, five hundred eight thousand, five hundred nineteen".