18817989107 has 2 divisors, whose sum is σ = 18817989108. Its totient is φ = 18817989106.

The previous prime is 18817989049. The next prime is 18817989131. The reversal of 18817989107 is 70198971881.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18817989107 - 2⁸ = 18817988851 is a prime.

It is not a weakly prime, because it can be changed into another prime (18817989187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9408994553 + 9408994554.

It is an arithmetic number, because the mean of its divisors is an integer number (9408994554).

Almost surely, 2^18817989107 is an apocalyptic number.

18817989107 is a deficient number, since it is larger than the sum of its proper divisors (1).

18817989107 is an equidigital number, since it uses as much as digits as its factorization.

18817989107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2032128, while the sum is 59.

The spelling of 18817989107 in words is "eighteen billion, eight hundred seventeen million, nine hundred eighty-nine thousand, one hundred seven".