818229393638 has 16 divisors (see below), whose sum is σ = 1256109192576. Its totient is φ = 399595560000.

The previous prime is 818229393629. The next prime is 818229393643. The reversal of 818229393638 is 836393922818.

818229393638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×818229393638² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17283863 + ... + 17331138.

It is an arithmetic number, because the mean of its divisors is an integer number (78506824536).

Almost surely, 2^818229393638 is an apocalyptic number.

818229393638 is a deficient number, since it is larger than the sum of its proper divisors (437879798938).

818229393638 is a wasteful number, since it uses less digits than its factorization.

818229393638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34615279.

The product of its digits is 26873856, while the sum is 62.

The spelling of 818229393638 in words is "eight hundred eighteen billion, two hundred twenty-nine million, three hundred ninety-three thousand, six hundred thirty-eight".