18186875117 has 2 divisors, whose sum is σ = 18186875118. Its totient is φ = 18186875116.

The previous prime is 18186875089. The next prime is 18186875137. The reversal of 18186875117 is 71157868181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17747301961 + 439573156 = 133219^2 + 20966^2 .

It is a cyclic number.

It is not a de Polignac number, because 18186875117 - 2⁶ = 18186875053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18186875137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9093437558 + 9093437559.

It is an arithmetic number, because the mean of its divisors is an integer number (9093437559).

Almost surely, 2^18186875117 is an apocalyptic number.

It is an amenable number.

18186875117 is a deficient number, since it is larger than the sum of its proper divisors (1).

18186875117 is an equidigital number, since it uses as much as digits as its factorization.

18186875117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 752640, while the sum is 53.

The spelling of 18186875117 in words is "eighteen billion, one hundred eighty-six million, eight hundred seventy-five thousand, one hundred seventeen".