665506756 has 24 divisors (see below), whose sum is σ = 1180539360. Its totient is φ = 328228032.

The previous prime is 665506741. The next prime is 665506757. The reversal of 665506756 is 657605566.

It is not an unprimeable number, because it can be changed into a prime (665506757) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164251 + ... + 168253.

It is an arithmetic number, because the mean of its divisors is an integer number (49189140).

Almost surely, 2^665506756 is an apocalyptic number.

It is an amenable number.

665506756 is a deficient number, since it is larger than the sum of its proper divisors (515032604).

665506756 is a wasteful number, since it uses less digits than its factorization.

665506756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4563 (or 4561 counting only the distinct ones).

The product of its (nonzero) digits is 1134000, while the sum is 46.

The square root of 665506756 is about 25797.4176227001. The cubic root of 665506756 is about 873.0735329751.

The spelling of 665506756 in words is "six hundred sixty-five million, five hundred six thousand, seven hundred fifty-six".