18943078988 has 24 divisors (see below), whose sum is σ = 35111460384. Its totient is φ = 8911584000.

The previous prime is 18943078981. The next prime is 18943078991. The reversal of 18943078988 is 88987034981.

It is not an unprimeable number, because it can be changed into a prime (18943078981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182273 + ... + 266663.

It is an arithmetic number, because the mean of its divisors is an integer number (1462977516).

Almost surely, 2^18943078988 is an apocalyptic number.

It is an amenable number.

18943078988 is a deficient number, since it is larger than the sum of its proper divisors (16168381396).

18943078988 is a wasteful number, since it uses less digits than its factorization.

18943078988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87713 (or 87711 counting only the distinct ones).

The product of its (nonzero) digits is 27869184, while the sum is 65.

The spelling of 18943078988 in words is "eighteen billion, nine hundred forty-three million, seventy-eight thousand, nine hundred eighty-eight".