638771432763 has 16 divisors (see below), whose sum is σ = 872495713152. Its totient is φ = 415448040000.

The previous prime is 638771432707. The next prime is 638771432773. The reversal of 638771432763 is 367234177836.

It is a happy number.

It is not a de Polignac number, because 638771432763 - 2⁹ = 638771432251 is a prime.

It is not an unprimeable number, because it can be changed into a prime (638771432773) 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 15 ways as a sum of consecutive naturals, for example, 5269788 + ... + 5389638.

It is an arithmetic number, because the mean of its divisors is an integer number (54530982072).

Almost surely, 2^638771432763 is an apocalyptic number.

638771432763 is a deficient number, since it is larger than the sum of its proper divisors (233724280389).

638771432763 is a wasteful number, since it uses less digits than its factorization.

638771432763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163226.

The product of its digits is 21337344, while the sum is 57.

The spelling of 638771432763 in words is "six hundred thirty-eight billion, seven hundred seventy-one million, four hundred thirty-two thousand, seven hundred sixty-three".