6642385768 has 16 divisors (see below), whose sum is σ = 12484930500. Its totient is φ = 3313070976.

The previous prime is 6642385723. The next prime is 6642385781. The reversal of 6642385768 is 8675832466.

It can be written as a sum of positive squares in 2 ways, for example, as 5562474724 + 1079911044 = 74582^2 + 32862^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1011763 + ... + 1018306.

Almost surely, 2^6642385768 is an apocalyptic number.

It is an amenable number.

6642385768 is a deficient number, since it is larger than the sum of its proper divisors (5842544732).

6642385768 is a wasteful number, since it uses less digits than its factorization.

6642385768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2030484 (or 2030480 counting only the distinct ones).

The product of its digits is 11612160, while the sum is 55.

The square root of 6642385768 is about 81500.8329282591. The cubic root of 6642385768 is about 1879.7843580940.

The spelling of 6642385768 in words is "six billion, six hundred forty-two million, three hundred eighty-five thousand, seven hundred sixty-eight".