638818883145 has 16 divisors (see below), whose sum is σ = 1135678014720. Its totient is φ = 340703404272.

The previous prime is 638818883119. The next prime is 638818883161. The reversal of 638818883145 is 541388818836.

638818883145 is a `hidden beast` number, since 6 + 388 + 188 + 8 + 31 + 45 = 666.

It is not a de Polignac number, because 638818883145 - 2⁹ = 638818882633 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2365995729 + ... + 2365995998.

It is an arithmetic number, because the mean of its divisors is an integer number (70979875920).

Almost surely, 2^638818883145 is an apocalyptic number.

It is an amenable number.

638818883145 is a deficient number, since it is larger than the sum of its proper divisors (496859131575).

638818883145 is a wasteful number, since it uses less digits than its factorization.

638818883145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4731991741 (or 4731991735 counting only the distinct ones).

The product of its digits is 35389440, while the sum is 63.

The spelling of 638818883145 in words is "six hundred thirty-eight billion, eight hundred eighteen million, eight hundred eighty-three thousand, one hundred forty-five".