639712591633 has 8 divisors (see below), whose sum is σ = 678040333920. Its totient is φ = 601462359360.

The previous prime is 639712591561. The next prime is 639712591711. The reversal of 639712591633 is 336195217936.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-639712591633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639712591733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19360503 + ... + 19393516.

It is an arithmetic number, because the mean of its divisors is an integer number (84755041740).

Almost surely, 2^639712591633 is an apocalyptic number.

It is an amenable number.

639712591633 is a deficient number, since it is larger than the sum of its proper divisors (38327742287).

639712591633 is a wasteful number, since it uses less digits than its factorization.

639712591633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38755007.

The product of its digits is 5511240, while the sum is 55.

The spelling of 639712591633 in words is "six hundred thirty-nine billion, seven hundred twelve million, five hundred ninety-one thousand, six hundred thirty-three".