161666768 has 10 divisors (see below), whose sum is σ = 313229394. Its totient is φ = 80833376.

The previous prime is 161666717. The next prime is 161666777. The reversal of 161666768 is 867666161.

It can be written as a sum of positive squares in only one way, i.e., 161594944 + 71824 = 12712^2 + 268^2 .

It is a super-2 number, since 2×161666768² = 52272287751131648, which contains 22 as substring.

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 as a sum of consecutive naturals, namely, 5052071 + ... + 5052102.

Almost surely, 2^161666768 is an apocalyptic number.

It is an amenable number.

161666768 is a deficient number, since it is larger than the sum of its proper divisors (151562626).

161666768 is a wasteful number, since it uses less digits than its factorization.

161666768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10104181 (or 10104175 counting only the distinct ones).

The product of its digits is 435456, while the sum is 47.

The square root of 161666768 is about 12714.8247333575. The cubic root of 161666768 is about 544.7621418072.

The spelling of 161666768 in words is "one hundred sixty-one million, six hundred sixty-six thousand, seven hundred sixty-eight".