6640662240664 has 32 divisors (see below), whose sum is σ = 12495293400240. Its totient is φ = 3308586825600.

The previous prime is 6640662240661. The next prime is 6640662240679. The reversal of 6640662240664 is 4660422660466.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640662240661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19097719 + ... + 19442329.

Almost surely, 2^{6640662240664} is an apocalyptic number.

It is an amenable number.

6640662240664 is a deficient number, since it is larger than the sum of its proper divisors (5854631159576).

6640662240664 is a wasteful number, since it uses less digits than its factorization.

6640662240664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353131 (or 353127 counting only the distinct ones).

The product of its (nonzero) digits is 11943936, while the sum is 52.

The spelling of 6640662240664 in words is "six trillion, six hundred forty billion, six hundred sixty-two million, two hundred forty thousand, six hundred sixty-four".