638574897863 has 16 divisors (see below), whose sum is σ = 730889409600. Its totient is φ = 546533222400.

The previous prime is 638574897859. The next prime is 638574897899. The reversal of 638574897863 is 368798475836.

638574897863 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 638574897863 - 2² = 638574897859 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638574897823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18786203 + ... + 18820163.

It is an arithmetic number, because the mean of its divisors is an integer number (45680588100).

Almost surely, 2^638574897863 is an apocalyptic number.

638574897863 is a deficient number, since it is larger than the sum of its proper divisors (92314511737).

638574897863 is a wasteful number, since it uses less digits than its factorization.

638574897863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37898.

The product of its digits is 1463132160, while the sum is 74.

The spelling of 638574897863 in words is "six hundred thirty-eight billion, five hundred seventy-four million, eight hundred ninety-seven thousand, eight hundred sixty-three".