18186163169 has 2 divisors, whose sum is σ = 18186163170. Its totient is φ = 18186163168.

The previous prime is 18186163147. The next prime is 18186163201. The reversal of 18186163169 is 96136168181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9182430625 + 9003732544 = 95825^2 + 94888^2 .

It is an emirp because it is prime and its reverse (96136168181) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18186163169 is a prime.

It is a super-2 number, since 2×18186163169² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18186163069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9093081584 + 9093081585.

It is an arithmetic number, because the mean of its divisors is an integer number (9093081585).

Almost surely, 2^18186163169 is an apocalyptic number.

It is an amenable number.

18186163169 is a deficient number, since it is larger than the sum of its proper divisors (1).

18186163169 is an equidigital number, since it uses as much as digits as its factorization.

18186163169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 50.

The spelling of 18186163169 in words is "eighteen billion, one hundred eighty-six million, one hundred sixty-three thousand, one hundred sixty-nine".