668497165 has 8 divisors (see below), whose sum is σ = 916796160. Its totient is φ = 458398032.

The previous prime is 668497157. The next prime is 668497177. The reversal of 668497165 is 561794866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 668497165 - 2³ = 668497157 is a prime.

It is a super-2 number, since 2×668497165² = 893776919226074450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9549925 + ... + 9549994.

It is an arithmetic number, because the mean of its divisors is an integer number (114599520).

Almost surely, 2^668497165 is an apocalyptic number.

It is an amenable number.

668497165 is a deficient number, since it is larger than the sum of its proper divisors (248298995).

668497165 is a wasteful number, since it uses less digits than its factorization.

668497165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19099931.

The product of its digits is 2177280, while the sum is 52.

The square root of 668497165 is about 25855.3121234303. The cubic root of 668497165 is about 874.3792778611.

The spelling of 668497165 in words is "six hundred sixty-eight million, four hundred ninety-seven thousand, one hundred sixty-five".