161632664 has 8 divisors (see below), whose sum is σ = 303061260. Its totient is φ = 80816328.

The previous prime is 161632663. The next prime is 161632693. The reversal of 161632664 is 466236161.

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

It is a super-2 number, since 2×161632664² = 52250236143473792, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161632663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10102034 + ... + 10102049.

Almost surely, 2^161632664 is an apocalyptic number.

It is an amenable number.

161632664 is a deficient number, since it is larger than the sum of its proper divisors (141428596).

161632664 is a wasteful number, since it uses less digits than its factorization.

161632664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20204089 (or 20204085 counting only the distinct ones).

The product of its digits is 31104, while the sum is 35.

The square root of 161632664 is about 12713.4835509391. The cubic root of 161632664 is about 544.7238328113.

The spelling of 161632664 in words is "one hundred sixty-one million, six hundred thirty-two thousand, six hundred sixty-four".