161720968 has 16 divisors (see below), whose sum is σ = 303367680. Its totient is φ = 80822928.

The previous prime is 161720957. The next prime is 161720971. The reversal of 161720968 is 869027161.

It is a self number, because there is not a number n which added to its sum of digits gives 161720968.

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, 23721 + ... + 29767.

It is an arithmetic number, because the mean of its divisors is an integer number (18960480).

Almost surely, 2^161720968 is an apocalyptic number.

It is an amenable number.

161720968 is a deficient number, since it is larger than the sum of its proper divisors (141646712).

161720968 is a wasteful number, since it uses less digits than its factorization.

161720968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9396 (or 9392 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 161720968 is about 12716.9559250632. The cubic root of 161720968 is about 544.8230135403.

The spelling of 161720968 in words is "one hundred sixty-one million, seven hundred twenty thousand, nine hundred sixty-eight".