18192918217 has 2 divisors, whose sum is σ = 18192918218. Its totient is φ = 18192918216.

The previous prime is 18192918187. The next prime is 18192918257. The reversal of 18192918217 is 71281929181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12701515401 + 5491402816 = 112701^2 + 74104^2 .

It is a cyclic number.

It is not a de Polignac number, because 18192918217 - 2⁷ = 18192918089 is a prime.

It is not a weakly prime, because it can be changed into another prime (18192918257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9096459108 + 9096459109.

It is an arithmetic number, because the mean of its divisors is an integer number (9096459109).

Almost surely, 2^18192918217 is an apocalyptic number.

It is an amenable number.

18192918217 is a deficient number, since it is larger than the sum of its proper divisors (1).

18192918217 is an equidigital number, since it uses as much as digits as its factorization.

18192918217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 49.

The spelling of 18192918217 in words is "eighteen billion, one hundred ninety-two million, nine hundred eighteen thousand, two hundred seventeen".