6640566045440 has 36 divisors (see below), whose sum is σ = 15906230858784. Its totient is φ = 2656226417664.

The previous prime is 6640566045431. The next prime is 6640566045469. The reversal of 6640566045440 is 445406650466.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2593969832 + ... + 2593972391.

Almost surely, 2^{6640566045440} is an apocalyptic number.

It is an amenable number.

6640566045440 is an abundant number, since it is smaller than the sum of its proper divisors (9265664813344).

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

6640566045440 is an equidigital number, since it uses as much as digits as its factorization.

6640566045440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5187942244 (or 5187942230 counting only the distinct ones).

The product of its (nonzero) digits is 8294400, while the sum is 50.

The spelling of 6640566045440 in words is "six trillion, six hundred forty billion, five hundred sixty-six million, forty-five thousand, four hundred forty".