6656444680 has 32 divisors (see below), whose sum is σ = 14979758040. Its totient is φ = 2662087680.

The previous prime is 6656444671. The next prime is 6656444689. The reversal of 6656444680 is 864446566.

It is an interprime number because it is at equal distance from previous prime (6656444671) and next prime (6656444689).

It can be written as a sum of positive squares in 4 ways, for example, as 6392642116 + 263802564 = 79954^2 + 16242^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (6656444689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 270490 + ... + 294070.

Almost surely, 2^6656444680 is an apocalyptic number.

It is an amenable number.

6656444680 is an abundant number, since it is smaller than the sum of its proper divisors (8323313360).

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

6656444680 is a wasteful number, since it uses less digits than its factorization.

6656444680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30649 (or 30645 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 49.

The square root of 6656444680 is about 81587.0374508108. The cubic root of 6656444680 is about 1881.1096399292.

The spelling of 6656444680 in words is "six billion, six hundred fifty-six million, four hundred forty-four thousand, six hundred eighty".