639252661733 has 8 divisors (see below), whose sum is σ = 773549439552. Its totient is φ = 515699626176.

The previous prime is 639252661717. The next prime is 639252661763. The reversal of 639252661733 is 337166252936.

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

It is not a de Polignac number, because 639252661733 - 2⁴ = 639252661717 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 (639252661763) 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, 2685935435 + ... + 2685935672.

It is an arithmetic number, because the mean of its divisors is an integer number (96693679944).

Almost surely, 2^639252661733 is an apocalyptic number.

It is an amenable number.

639252661733 is a deficient number, since it is larger than the sum of its proper divisors (134296777819).

639252661733 is a wasteful number, since it uses less digits than its factorization.

639252661733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5371871131.

The product of its digits is 7348320, while the sum is 53.

The spelling of 639252661733 in words is "six hundred thirty-nine billion, two hundred fifty-two million, six hundred sixty-one thousand, seven hundred thirty-three".