161222221984 has 24 divisors (see below), whose sum is σ = 317658438720. Its totient is φ = 80547062976.

The previous prime is 161222221949. The next prime is 161222222017. The reversal of 161222221984 is 489122222161.

It is a super-2 number, since 2×161222221984² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1960584 + ... + 2041159.

It is an arithmetic number, because the mean of its divisors is an integer number (13235768280).

Almost surely, 2^161222221984 is an apocalyptic number.

It is an amenable number.

161222221984 is a deficient number, since it is larger than the sum of its proper divisors (156436216736).

161222221984 is a wasteful number, since it uses less digits than its factorization.

161222221984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4003012 (or 4003004 counting only the distinct ones).

The product of its digits is 55296, while the sum is 40.

The spelling of 161222221984 in words is "one hundred sixty-one billion, two hundred twenty-two million, two hundred twenty-one thousand, nine hundred eighty-four".