665395056 has 30 divisors (see below), whose sum is σ = 1862182400. Its totient is φ = 221798304.

The previous prime is 665395021. The next prime is 665395063. The reversal of 665395056 is 650593566.

665395056 is a `hidden beast` number, since 66 + 539 + 5 + 0 + 56 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2310256 + ... + 2310543.

Almost surely, 2^665395056 is an apocalyptic number.

It is an amenable number.

665395056 is an abundant number, since it is smaller than the sum of its proper divisors (1196787344).

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

665395056 is a wasteful number, since it uses less digits than its factorization.

665395056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4620813 (or 4620804 counting only the distinct ones).

The product of its (nonzero) digits is 729000, while the sum is 45.

The square root of 665395056 is about 25795.2525864741. The cubic root of 665395056 is about 873.0246840995.

The spelling of 665395056 in words is "six hundred sixty-five million, three hundred ninety-five thousand, fifty-six".