6464441644 has 12 divisors (see below), whose sum is σ = 11313364104. Its totient is φ = 3232051904.

The previous prime is 6464441629. The next prime is 6464441653. The reversal of 6464441644 is 4461444646.

It is a self number, because there is not a number n which added to its sum of digits gives 6464441644.

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, 89607 + ... + 144769.

It is an arithmetic number, because the mean of its divisors is an integer number (942780342).

Almost surely, 2^6464441644 is an apocalyptic number.

It is an amenable number.

6464441644 is a deficient number, since it is larger than the sum of its proper divisors (4848922460).

6464441644 is a wasteful number, since it uses less digits than its factorization.

6464441644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84464 (or 84462 counting only the distinct ones).

The product of its digits is 884736, while the sum is 43.

The square root of 6464441644 is about 80401.7514983349. The cubic root of 6464441644 is about 1862.8462266667.

The spelling of 6464441644 in words is "six billion, four hundred sixty-four million, four hundred forty-one thousand, six hundred forty-four".