161579892621 has 24 divisors (see below), whose sum is σ = 250631124960. Its totient is φ = 92324951712.

The previous prime is 161579892611. The next prime is 161579892653. The reversal of 161579892621 is 126298975161.

It is a happy number.

It is not a de Polignac number, because 161579892621 - 2²¹ = 161577795469 is a prime.

It is a super-2 number, since 2×161579892621² (a number of 23 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (57) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161579892601) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2799270 + ... + 2856408.

It is an arithmetic number, because the mean of its divisors is an integer number (10442963540).

Almost surely, 2^161579892621 is an apocalyptic number.

It is an amenable number.

161579892621 is a deficient number, since it is larger than the sum of its proper divisors (89051232339).

161579892621 is a wasteful number, since it uses less digits than its factorization.

161579892621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76393 (or 76386 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 57.

The spelling of 161579892621 in words is "one hundred sixty-one billion, five hundred seventy-nine million, eight hundred ninety-two thousand, six hundred twenty-one".