668807161 has 16 divisors (see below), whose sum is σ = 735628608. Its totient is φ = 603014400.

The previous prime is 668807147. The next prime is 668807173. The reversal of 668807161 is 161708866.

It is a cyclic number.

It is not a de Polignac number, because 668807161 - 2⁷ = 668807033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (668807141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1171006 + ... + 1171576.

It is an arithmetic number, because the mean of its divisors is an integer number (45976788).

Almost surely, 2^668807161 is an apocalyptic number.

It is an amenable number.

668807161 is a deficient number, since it is larger than the sum of its proper divisors (66821447).

668807161 is a wasteful number, since it uses less digits than its factorization.

668807161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1272.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 668807161 is about 25861.3062508451. The cubic root of 668807161 is about 874.5144129102.

The spelling of 668807161 in words is "six hundred sixty-eight million, eight hundred seven thousand, one hundred sixty-one".