660664611 has 12 divisors (see below), whose sum is σ = 977569320. Its totient is φ = 429700320.

The previous prime is 660664579. The next prime is 660664619. The reversal of 660664611 is 116466066.

660664611 is a `hidden beast` number, since 6 + 6 + 0 + 6 + 646 + 1 + 1 = 666.

It is not a de Polignac number, because 660664611 - 2⁵ = 660664579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (660664619) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 894841 + ... + 895578.

It is an arithmetic number, because the mean of its divisors is an integer number (81464110).

Almost surely, 2^660664611 is an apocalyptic number.

660664611 is a deficient number, since it is larger than the sum of its proper divisors (316904709).

660664611 is a wasteful number, since it uses less digits than its factorization.

660664611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1790466 (or 1790463 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 660664611 is about 25703.3968766776. The cubic root of 660664611 is about 870.9509182452.

It can be divided in two parts, 6606 and 64611, that added together give a palindrome (71217).

The spelling of 660664611 in words is "six hundred sixty million, six hundred sixty-four thousand, six hundred eleven".