6656660660 has 48 divisors (see below), whose sum is σ = 15223496400. Its totient is φ = 2430219264.

The previous prime is 6656660653. The next prime is 6656660669. The reversal of 6656660660 is 660666566.

It can be written as a sum of positive squares in 8 ways, for example, as 80748196 + 6575912464 = 8986^2 + 81092^2 .

It is a super-2 number, since 2×6656660660² = 88622262284783271200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6656660669) 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, 120695 + ... + 166974.

It is an arithmetic number, because the mean of its divisors is an integer number (317156175).

Almost surely, 2^6656660660 is an apocalyptic number.

It is an amenable number.

6656660660 is an abundant number, since it is smaller than the sum of its proper divisors (8566835740).

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

6656660660 is a wasteful number, since it uses less digits than its factorization.

6656660660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287780 (or 287778 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 47.

The square root of 6656660660 is about 81588.3610571998. The cubic root of 6656660660 is about 1881.1299850076.

The spelling of 6656660660 in words is "six billion, six hundred fifty-six million, six hundred sixty thousand, six hundred sixty".