161675681564 has 6 divisors (see below), whose sum is σ = 282932442744. Its totient is φ = 80837840780.

The previous prime is 161675681537. The next prime is 161675681599. The reversal of 161675681564 is 465186576161.

It is a happy number.

It is a super-2 number, since 2×161675681564² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20209460192 + ... + 20209460199.

It is an arithmetic number, because the mean of its divisors is an integer number (47155407124).

Almost surely, 2^161675681564 is an apocalyptic number.

It is an amenable number.

161675681564 is a deficient number, since it is larger than the sum of its proper divisors (121256761180).

161675681564 is a wasteful number, since it uses less digits than its factorization.

161675681564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40418920395 (or 40418920393 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 56.

The spelling of 161675681564 in words is "one hundred sixty-one billion, six hundred seventy-five million, six hundred eighty-one thousand, five hundred sixty-four".