638581243603 has 12 divisors (see below), whose sum is σ = 688985589880. Its totient is φ = 590216267520.

The previous prime is 638581243463. The next prime is 638581243681. The reversal of 638581243603 is 306342185836.

It is a de Polignac number, because none of the positive numbers 2^k-638581243603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638581243103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9964950 + ... + 10028827.

Almost surely, 2^638581243603 is an apocalyptic number.

638581243603 is a deficient number, since it is larger than the sum of its proper divisors (50404346277).

638581243603 is a wasteful number, since it uses less digits than its factorization.

638581243603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19993878 (or 19993837 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 49.

The spelling of 638581243603 in words is "six hundred thirty-eight billion, five hundred eighty-one million, two hundred forty-three thousand, six hundred three".