18638823652 has 12 divisors (see below), whose sum is σ = 33311940480. Its totient is φ = 9121126376.

The previous prime is 18638823649. The next prime is 18638823673. The reversal of 18638823652 is 25632883681.

It is a self number, because there is not a number n which added to its sum of digits gives 18638823652.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49571152 + ... + 49571527.

It is an arithmetic number, because the mean of its divisors is an integer number (2775995040).

Almost surely, 2^18638823652 is an apocalyptic number.

It is an amenable number.

18638823652 is a deficient number, since it is larger than the sum of its proper divisors (14673116828).

18638823652 is a wasteful number, since it uses less digits than its factorization.

18638823652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99142730 (or 99142728 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 52.

The spelling of 18638823652 in words is "eighteen billion, six hundred thirty-eight million, eight hundred twenty-three thousand, six hundred fifty-two".