665857368 has 64 divisors (see below), whose sum is σ = 2017756800. Its totient is φ = 201774240.

The previous prime is 665857363. The next prime is 665857369. The reversal of 665857368 is 863758566.

665857368 is a `hidden beast` number, since 6 + 6 + 5 + 8 + 573 + 68 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665857363) 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, 137746 + ... + 142497.

It is an arithmetic number, because the mean of its divisors is an integer number (31527450).

Almost surely, 2^665857368 is an apocalyptic number.

It is an amenable number.

665857368 is an abundant number, since it is smaller than the sum of its proper divisors (1351899432).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665857368 is a wasteful number, since it uses less digits than its factorization.

665857368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280269 (or 280259 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 54.

The square root of 665857368 is about 25804.2122142878. The cubic root of 665857368 is about 873.2268278461.

The spelling of 665857368 in words is "six hundred sixty-five million, eight hundred fifty-seven thousand, three hundred sixty-eight".