6639904580265 has 72 divisors (see below), whose sum is σ = 12734353230144. Its totient is φ = 3198027096000.

The previous prime is 6639904580233. The next prime is 6639904580269. The reversal of 6639904580265 is 5620854099366.

6639904580265 is a `hidden beast` number, since 6 + 6 + 39 + 90 + 458 + 0 + 2 + 65 = 666.

It is not a de Polignac number, because 6639904580265 - 2⁵ = 6639904580233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6639904580269) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3215719 + ... + 4860108.

Almost surely, 2^{6639904580265} is an apocalyptic number.

It is an amenable number.

6639904580265 is a deficient number, since it is larger than the sum of its proper divisors (6094448649879).

6639904580265 is a wasteful number, since it uses less digits than its factorization.

6639904580265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8076011 (or 8075997 counting only the distinct ones).

The product of its (nonzero) digits is 83980800, while the sum is 63.

The spelling of 6639904580265 in words is "six trillion, six hundred thirty-nine billion, nine hundred four million, five hundred eighty thousand, two hundred sixty-five".