2640240606644 has 24 divisors (see below), whose sum is σ = 4679374260288. Its totient is φ = 1303353976320.

The previous prime is 2640240606611. The next prime is 2640240606697. The reversal of 2640240606644 is 4466060420462.

It is a junction number, because it is equal to n+sod(n) for n = 2640240606595 and 2640240606604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9543917 + ... + 9816660.

It is an arithmetic number, because the mean of its divisors is an integer number (194973927512).

Almost surely, 2^{2640240606644} is an apocalyptic number.

It is an amenable number.

2640240606644 is a deficient number, since it is larger than the sum of its proper divisors (2039133653644).

2640240606644 is a wasteful number, since it uses less digits than its factorization.

2640240606644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19361015 (or 19361013 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 44.

The spelling of 2640240606644 in words is "two trillion, six hundred forty billion, two hundred forty million, six hundred six thousand, six hundred forty-four".