639683639111 has 16 divisors (see below), whose sum is σ = 717108190080. Its totient is φ = 565489032480.

The previous prime is 639683639099. The next prime is 639683639149. The reversal of 639683639111 is 111936386936.

It is a cyclic number.

It is not a de Polignac number, because 639683639111 - 2⁶ = 639683639047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639683639311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 261200 + ... + 1160858.

It is an arithmetic number, because the mean of its divisors is an integer number (44819261880).

Almost surely, 2^639683639111 is an apocalyptic number.

639683639111 is a deficient number, since it is larger than the sum of its proper divisors (77424550969).

639683639111 is a wasteful number, since it uses less digits than its factorization.

639683639111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901454.

The product of its digits is 3779136, while the sum is 56.

The spelling of 639683639111 in words is "six hundred thirty-nine billion, six hundred eighty-three million, six hundred thirty-nine thousand, one hundred eleven".