18881683187 has 2 divisors, whose sum is σ = 18881683188. Its totient is φ = 18881683186.

The previous prime is 18881683151. The next prime is 18881683201. The reversal of 18881683187 is 78138618881.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18881683187 - 2⁶ = 18881683123 is a prime.

It is not a weakly prime, because it can be changed into another prime (18881683987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9440841593 + 9440841594.

It is an arithmetic number, because the mean of its divisors is an integer number (9440841594).

Almost surely, 2^18881683187 is an apocalyptic number.

18881683187 is a deficient number, since it is larger than the sum of its proper divisors (1).

18881683187 is an equidigital number, since it uses as much as digits as its factorization.

18881683187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4128768, while the sum is 59.

The spelling of 18881683187 in words is "eighteen billion, eight hundred eighty-one million, six hundred eighty-three thousand, one hundred eighty-seven".