6643702838444 has 12 divisors (see below), whose sum is σ = 13287405676944. Its totient is φ = 2847301216464.

The previous prime is 6643702838429. The next prime is 6643702838467. The reversal of 6643702838444 is 4448382073466.

6643702838444 is an admirable number.

It is a super-2 number, since 2×6643702838444² (a number of 26 digits) contains 22 as substring.

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, 118637550659 + ... + 118637550714.

It is an arithmetic number, because the mean of its divisors is an integer number (1107283806412).

Almost surely, 2^{6643702838444} is an apocalyptic number.

It is an amenable number.

6643702838444 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

6643702838444 is a wasteful number, since it uses less digits than its factorization.

6643702838444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237275101384 (or 237275101382 counting only the distinct ones).

The product of its (nonzero) digits is 74317824, while the sum is 59.

The spelling of 6643702838444 in words is "six trillion, six hundred forty-three billion, seven hundred two million, eight hundred thirty-eight thousand, four hundred forty-four".