18366612497 has 2 divisors, whose sum is σ = 18366612498. Its totient is φ = 18366612496.

The previous prime is 18366612461. The next prime is 18366612499. The reversal of 18366612497 is 79421666381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9577362496 + 8789250001 = 97864^2 + 93751^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18366612497 is a prime.

It is a super-2 number, since 2×18366612497² (a number of 21 digits) contains 22 as substring.

Together with 18366612499, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18366612499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9183306248 + 9183306249.

It is an arithmetic number, because the mean of its divisors is an integer number (9183306249).

Almost surely, 2^18366612497 is an apocalyptic number.

It is an amenable number.

18366612497 is a deficient number, since it is larger than the sum of its proper divisors (1).

18366612497 is an equidigital number, since it uses as much as digits as its factorization.

18366612497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2612736, while the sum is 53.

The spelling of 18366612497 in words is "eighteen billion, three hundred sixty-six million, six hundred twelve thousand, four hundred ninety-seven".