642664336 has 10 divisors (see below), whose sum is σ = 1245162182. Its totient is φ = 321332160.

The previous prime is 642664301. The next prime is 642664339. The reversal of 642664336 is 633466246.

It can be written as a sum of positive squares in only one way, i.e., 638067600 + 4596736 = 25260^2 + 2144^2 .

It is not an unprimeable number, because it can be changed into a prime (642664339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20083245 + ... + 20083276.

Almost surely, 2^642664336 is an apocalyptic number.

It is an amenable number.

642664336 is a deficient number, since it is larger than the sum of its proper divisors (602497846).

642664336 is a wasteful number, since it uses less digits than its factorization.

642664336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40166529 (or 40166523 counting only the distinct ones).

The product of its digits is 373248, while the sum is 40.

The square root of 642664336 is about 25350.8251542233. The cubic root of 642664336 is about 862.9680824356.

The spelling of 642664336 in words is "six hundred forty-two million, six hundred sixty-four thousand, three hundred thirty-six".