161646872 has 8 divisors (see below), whose sum is σ = 303087900. Its totient is φ = 80823432.

The previous prime is 161646869. The next prime is 161646883. The reversal of 161646872 is 278646161.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×161646872² = 52259422454768768, which 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, 10102922 + ... + 10102937.

Almost surely, 2^161646872 is an apocalyptic number.

It is an amenable number.

161646872 is a deficient number, since it is larger than the sum of its proper divisors (141441028).

161646872 is a wasteful number, since it uses less digits than its factorization.

161646872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20205865 (or 20205861 counting only the distinct ones).

The product of its digits is 96768, while the sum is 41.

The square root of 161646872 is about 12714.0423154872. The cubic root of 161646872 is about 544.7397933011.

The spelling of 161646872 in words is "one hundred sixty-one million, six hundred forty-six thousand, eight hundred seventy-two".