161806672 has 20 divisors (see below), whose sum is σ = 314042400. Its totient is φ = 80763488.

The previous prime is 161806651. The next prime is 161806681. The reversal of 161806672 is 276608161.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1143 + ... + 18025.

It is an arithmetic number, because the mean of its divisors is an integer number (15702120).

Almost surely, 2^161806672 is an apocalyptic number.

It is an amenable number.

161806672 is a deficient number, since it is larger than the sum of its proper divisors (152235728).

161806672 is a wasteful number, since it uses less digits than its factorization.

161806672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17490 (or 17484 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 161806672 is about 12720.3251530769. The cubic root of 161806672 is about 544.9192394991.

The spelling of 161806672 in words is "one hundred sixty-one million, eight hundred six thousand, six hundred seventy-two".