161191664 has 20 divisors (see below), whose sum is σ = 319927440. Its totient is φ = 78629760.

The previous prime is 161191651. The next prime is 161191673. The reversal of 161191664 is 466191161.

161191664 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 122204 + ... + 123515.

It is an arithmetic number, because the mean of its divisors is an integer number (15996372).

Almost surely, 2^161191664 is an apocalyptic number.

It is an amenable number.

161191664 is a deficient number, since it is larger than the sum of its proper divisors (158735776).

161191664 is a wasteful number, since it uses less digits than its factorization.

161191664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245768 (or 245762 counting only the distinct ones).

The product of its digits is 7776, while the sum is 35.

The square root of 161191664 is about 12696.1279136593. The cubic root of 161191664 is about 544.2279717814.

The spelling of 161191664 in words is "one hundred sixty-one million, one hundred ninety-one thousand, six hundred sixty-four".