639631011763 has 4 divisors (see below), whose sum is σ = 641301067008. Its totient is φ = 637960956520.

The previous prime is 639631011743. The next prime is 639631011797. The reversal of 639631011763 is 367110136936.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-639631011763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639631011743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 835027048 + ... + 835027813.

It is an arithmetic number, because the mean of its divisors is an integer number (160325266752).

Almost surely, 2^639631011763 is an apocalyptic number.

639631011763 is a deficient number, since it is larger than the sum of its proper divisors (1670055245).

639631011763 is a wasteful number, since it uses less digits than its factorization.

639631011763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1670055244.

The product of its (nonzero) digits is 367416, while the sum is 46.

The spelling of 639631011763 in words is "six hundred thirty-nine billion, six hundred thirty-one million, eleven thousand, seven hundred sixty-three".