6639639407 has 8 divisors (see below), whose sum is σ = 6931610400. Its totient is φ = 6351869664.

The previous prime is 6639639403. The next prime is 6639639421. The reversal of 6639639407 is 7049369366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6639639407 - 2² = 6639639403 is a prime.

It is a super-2 number, since 2×6639639407² = 88169622909974623298, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6639639403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1047083 + ... + 1053404.

It is an arithmetic number, because the mean of its divisors is an integer number (866451300).

Almost surely, 2^6639639407 is an apocalyptic number.

6639639407 is a deficient number, since it is larger than the sum of its proper divisors (291970993).

6639639407 is a wasteful number, since it uses less digits than its factorization.

6639639407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2100625.

The product of its (nonzero) digits is 4408992, while the sum is 53.

The square root of 6639639407 is about 81483.9825180385. The cubic root of 6639639407 is about 1879.5252504832.

The spelling of 6639639407 in words is "six billion, six hundred thirty-nine million, six hundred thirty-nine thousand, four hundred seven".