665250668 has 12 divisors (see below), whose sum is σ = 1168720392. Its totient is φ = 331330560.

The previous prime is 665250661. The next prime is 665250683. The reversal of 665250668 is 866052566.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (665250661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 322538 + ... + 324593.

It is an arithmetic number, because the mean of its divisors is an integer number (97393366).

Almost surely, 2^665250668 is an apocalyptic number.

It is an amenable number.

665250668 is a deficient number, since it is larger than the sum of its proper divisors (503469724).

665250668 is a wasteful number, since it uses less digits than its factorization.

665250668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647392 (or 647390 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 44.

The square root of 665250668 is about 25792.4537025852. The cubic root of 665250668 is about 872.9615319386.

The spelling of 665250668 in words is "six hundred sixty-five million, two hundred fifty thousand, six hundred sixty-eight".