638823845023 has 48 divisors (see below), whose sum is σ = 814275624960. Its totient is φ = 496615783104.

The previous prime is 638823845003. The next prime is 638823845039. The reversal of 638823845023 is 320548328836.

It is a de Polignac number, because none of the positive numbers 2^k-638823845023 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638823845003) 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 47 ways as a sum of consecutive naturals, for example, 103989090 + ... + 103995232.

It is an arithmetic number, because the mean of its divisors is an integer number (16964075520).

Almost surely, 2^638823845023 is an apocalyptic number.

638823845023 is a deficient number, since it is larger than the sum of its proper divisors (175451779937).

638823845023 is a wasteful number, since it uses less digits than its factorization.

638823845023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8996 (or 8989 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 52.

The spelling of 638823845023 in words is "six hundred thirty-eight billion, eight hundred twenty-three million, eight hundred forty-five thousand, twenty-three".