639519344639 has 8 divisors (see below), whose sum is σ = 730912264320. Its totient is φ = 548134678296.

The previous prime is 639519344621. The next prime is 639519344647. The reversal of 639519344639 is 936443915936.

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 639519344639 - 2⁸ = 639519344383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639519344669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1896389 + ... + 2208014.

It is an arithmetic number, because the mean of its divisors is an integer number (91364033040).

Almost surely, 2^639519344639 is an apocalyptic number.

639519344639 is a deficient number, since it is larger than the sum of its proper divisors (91392919681).

639519344639 is a wasteful number, since it uses less digits than its factorization.

639519344639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4126669.

The product of its digits is 56687040, while the sum is 62.

The spelling of 639519344639 in words is "six hundred thirty-nine billion, five hundred nineteen million, three hundred forty-four thousand, six hundred thirty-nine".