639369685507 has 16 divisors (see below), whose sum is σ = 738364098240. Its totient is φ = 542314487808.

The previous prime is 639369685481. The next prime is 639369685519. The reversal of 639369685507 is 705586963936.

It is a cyclic number.

It is not a de Polignac number, because 639369685507 - 2¹⁹ = 639369161219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639369685567) 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 15 ways as a sum of consecutive naturals, for example, 747582 + ... + 1355587.

It is an arithmetic number, because the mean of its divisors is an integer number (46147756140).

Almost surely, 2^639369685507 is an apocalyptic number.

639369685507 is a deficient number, since it is larger than the sum of its proper divisors (98994412733).

639369685507 is a wasteful number, since it uses less digits than its factorization.

639369685507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2103630.

The product of its (nonzero) digits is 220449600, while the sum is 67.

The spelling of 639369685507 in words is "six hundred thirty-nine billion, three hundred sixty-nine million, six hundred eighty-five thousand, five hundred seven".