2640666644044 has 48 divisors (see below), whose sum is σ = 5434013190816. Its totient is φ = 1106961753600.

The previous prime is 2640666644023. The next prime is 2640666644053. The reversal of 2640666644044 is 4404466660462.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a junction number, because it is equal to n+sod(n) for n = 2640666643982 and 2640666644000.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1476687 + ... + 2731654.

It is an arithmetic number, because the mean of its divisors is an integer number (113208608142).

Almost surely, 2^{2640666644044} is an apocalyptic number.

It is an amenable number.

2640666644044 is an abundant number, since it is smaller than the sum of its proper divisors (2793346546772).

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

2640666644044 is a wasteful number, since it uses less digits than its factorization.

2640666644044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4209466 (or 4209464 counting only the distinct ones).

The product of its (nonzero) digits is 15925248, while the sum is 52.

The spelling of 2640666644044 in words is "two trillion, six hundred forty billion, six hundred sixty-six million, six hundred forty-four thousand, forty-four".