18943798828 has 12 divisors (see below), whose sum is σ = 33618573072. Its totient is φ = 9338492240.

The previous prime is 18943798801. The next prime is 18943798849. The reversal of 18943798828 is 82889734981.

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, 33351475 + ... + 33352042.

It is an arithmetic number, because the mean of its divisors is an integer number (2801547756).

Almost surely, 2^18943798828 is an apocalyptic number.

It is an amenable number.

18943798828 is a deficient number, since it is larger than the sum of its proper divisors (14674774244).

18943798828 is a wasteful number, since it uses less digits than its factorization.

18943798828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66703592 (or 66703590 counting only the distinct ones).

The product of its digits is 55738368, while the sum is 67.

The spelling of 18943798828 in words is "eighteen billion, nine hundred forty-three million, seven hundred ninety-eight thousand, eight hundred twenty-eight".