161617968 has 60 divisors (see below), whose sum is σ = 453229920. Its totient is φ = 53762688.

The previous prime is 161617943. The next prime is 161617991. The reversal of 161617968 is 869716161.

It is a super-2 number, since 2×161617968² = 52240735160898048, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 101305 + ... + 102887.

It is an arithmetic number, because the mean of its divisors is an integer number (7553832).

Almost surely, 2^161617968 is an apocalyptic number.

161617968 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

161617968 is an abundant number, since it is smaller than the sum of its proper divisors (291611952).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161617968 is a wasteful number, since it uses less digits than its factorization.

161617968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2306 (or 2297 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 161617968 is about 12712.9055687518. The cubic root of 161617968 is about 544.7073231450.

It can be divided in two parts, 16 and 1617968, that added together give a square (1617984 = 1272²).

The spelling of 161617968 in words is "one hundred sixty-one million, six hundred seventeen thousand, nine hundred sixty-eight".