2640040840644 has 12 divisors (see below), whose sum is σ = 6160095294864. Its totient is φ = 880013613544.

The previous prime is 2640040840601. The next prime is 2640040840669. The reversal of 2640040840644 is 4460480400462.

2640040840644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 2640040840596 and 2640040840605.

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, 110001701682 + ... + 110001701705.

It is an arithmetic number, because the mean of its divisors is an integer number (513341274572).

Almost surely, 2^{2640040840644} is an apocalyptic number.

It is an amenable number.

2640040840644 is an abundant number, since it is smaller than the sum of its proper divisors (3520054454220).

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

2640040840644 is a wasteful number, since it uses less digits than its factorization.

2640040840644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220003403394 (or 220003403392 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 42.

The spelling of 2640040840644 in words is "two trillion, six hundred forty billion, forty million, eight hundred forty thousand, six hundred forty-four".