18188861107 has 2 divisors, whose sum is σ = 18188861108. Its totient is φ = 18188861106.

The previous prime is 18188861099. The next prime is 18188861129. The reversal of 18188861107 is 70116888181.

It is a weak prime.

It is an emirp because it is prime and its reverse (70116888181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18188861107 - 2³ = 18188861099 is a prime.

It is not a weakly prime, because it can be changed into another prime (18188861707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9094430553 + 9094430554.

It is an arithmetic number, because the mean of its divisors is an integer number (9094430554).

Almost surely, 2^18188861107 is an apocalyptic number.

18188861107 is a deficient number, since it is larger than the sum of its proper divisors (1).

18188861107 is an equidigital number, since it uses as much as digits as its factorization.

18188861107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 172032, while the sum is 49.

The spelling of 18188861107 in words is "eighteen billion, one hundred eighty-eight million, eight hundred sixty-one thousand, one hundred seven".