18008397161 has 2 divisors, whose sum is σ = 18008397162. Its totient is φ = 18008397160.

The previous prime is 18008397151. The next prime is 18008397223. The reversal of 18008397161 is 16179380081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16865957161 + 1142440000 = 129869^2 + 33800^2 .

It is an emirp because it is prime and its reverse (16179380081) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18008397161 is a prime.

It is not a weakly prime, because it can be changed into another prime (18008397151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9004198580 + 9004198581.

It is an arithmetic number, because the mean of its divisors is an integer number (9004198581).

Almost surely, 2^18008397161 is an apocalyptic number.

It is an amenable number.

18008397161 is a deficient number, since it is larger than the sum of its proper divisors (1).

18008397161 is an equidigital number, since it uses as much as digits as its factorization.

18008397161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 44.

The spelling of 18008397161 in words is "eighteen billion, eight million, three hundred ninety-seven thousand, one hundred sixty-one".