18171425099 has 2 divisors, whose sum is σ = 18171425100. Its totient is φ = 18171425098.

The previous prime is 18171425071. The next prime is 18171425147. The reversal of 18171425099 is 99052417181.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18171425099 is a prime.

It is not a weakly prime, because it can be changed into another prime (18171422099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9085712549 + 9085712550.

It is an arithmetic number, because the mean of its divisors is an integer number (9085712550).

Almost surely, 2^18171425099 is an apocalyptic number.

18171425099 is a deficient number, since it is larger than the sum of its proper divisors (1).

18171425099 is an equidigital number, since it uses as much as digits as its factorization.

18171425099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 47.

The spelling of 18171425099 in words is "eighteen billion, one hundred seventy-one million, four hundred twenty-five thousand, ninety-nine".