161579747967 has 16 divisors (see below), whose sum is σ = 236432431872. Its totient is φ = 97340726720.

The previous prime is 161579747957. The next prime is 161579747971. The reversal of 161579747967 is 769747975161.

It is a cyclic number.

It is not a de Polignac number, because 161579747967 - 2²⁰ = 161578699391 is a prime.

It is a super-2 number, since 2×161579747967² (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 (161579747957) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14654238 + ... + 14665259.

It is an arithmetic number, because the mean of its divisors is an integer number (14777026992).

Almost surely, 2^161579747967 is an apocalyptic number.

161579747967 is a deficient number, since it is larger than the sum of its proper divisors (74852683905).

161579747967 is a wasteful number, since it uses less digits than its factorization.

161579747967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29319678.

The product of its digits is 140026320, while the sum is 69.

The spelling of 161579747967 in words is "one hundred sixty-one billion, five hundred seventy-nine million, seven hundred forty-seven thousand, nine hundred sixty-seven".