6643255627660 has 12 divisors (see below), whose sum is σ = 13950836818128. Its totient is φ = 2657302251056.

The previous prime is 6643255627639. The next prime is 6643255627711. The reversal of 6643255627660 is 667265523466.

It is a junction number, because it is equal to n+sod(n) for n = 6643255627595 and 6643255627604.

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, 166081390672 + ... + 166081390711.

It is an arithmetic number, because the mean of its divisors is an integer number (1162569734844).

Almost surely, 2^{6643255627660} is an apocalyptic number.

It is an amenable number.

6643255627660 is an abundant number, since it is smaller than the sum of its proper divisors (7307581190468).

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

6643255627660 is a wasteful number, since it uses less digits than its factorization.

6643255627660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332162781392 (or 332162781390 counting only the distinct ones).

The product of its (nonzero) digits is 65318400, while the sum is 58.

The spelling of 6643255627660 in words is "six trillion, six hundred forty-three billion, two hundred fifty-five million, six hundred twenty-seven thousand, six hundred sixty".