660637161 has 16 divisors (see below), whose sum is σ = 979272000. Its totient is φ = 440177184.

The previous prime is 660637157. The next prime is 660637171. The reversal of 660637161 is 161736066.

660637161 is a `hidden beast` number, since 6 + 6 + 0 + 637 + 16 + 1 = 666.

It is not a de Polignac number, because 660637161 - 2² = 660637157 is a prime.

It is not an unprimeable number, because it can be changed into a prime (660637151) 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, 50845 + ... + 62501.

It is an arithmetic number, because the mean of its divisors is an integer number (61204500).

Almost surely, 2^660637161 is an apocalyptic number.

It is an amenable number.

660637161 is a deficient number, since it is larger than the sum of its proper divisors (318634839).

660637161 is a wasteful number, since it uses less digits than its factorization.

660637161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13765 (or 13759 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 660637161 is about 25702.8628950162. The cubic root of 660637161 is about 870.9388556780.

The spelling of 660637161 in words is "six hundred sixty million, six hundred thirty-seven thousand, one hundred sixty-one".