161757968 has 10 divisors (see below), whose sum is σ = 313406094. Its totient is φ = 80878976.

The previous prime is 161757943. The next prime is 161757971. The reversal of 161757968 is 869757161.

It can be written as a sum of positive squares in only one way, i.e., 101042704 + 60715264 = 10052^2 + 7792^2 .

It is a super-2 number, since 2×161757968² = 52331280422978048, which contains 22 as substring.

It is an unprimeable number.

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, 5054921 + ... + 5054952.

Almost surely, 2^161757968 is an apocalyptic number.

It is an amenable number.

161757968 is a deficient number, since it is larger than the sum of its proper divisors (151648126).

161757968 is a wasteful number, since it uses less digits than its factorization.

161757968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10109881 (or 10109875 counting only the distinct ones).

The product of its digits is 635040, while the sum is 50.

The square root of 161757968 is about 12718.4105925230. The cubic root of 161757968 is about 544.8645602336.

The spelling of 161757968 in words is "one hundred sixty-one million, seven hundred fifty-seven thousand, nine hundred sixty-eight".