18171425147 has 2 divisors, whose sum is σ = 18171425148. Its totient is φ = 18171425146.

The previous prime is 18171425099. The next prime is 18171425159. The reversal of 18171425147 is 74152417181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18171425147 - 2⁸ = 18171424891 is a prime.

It is not a weakly prime, because it can be changed into another prime (18171425197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9085712573 + 9085712574.

It is an arithmetic number, because the mean of its divisors is an integer number (9085712574).

Almost surely, 2^18171425147 is an apocalyptic number.

18171425147 is a deficient number, since it is larger than the sum of its proper divisors (1).

18171425147 is an equidigital number, since it uses as much as digits as its factorization.

18171425147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62720, while the sum is 41.

The spelling of 18171425147 in words is "eighteen billion, one hundred seventy-one million, four hundred twenty-five thousand, one hundred forty-seven".