18665094397 has 2 divisors, whose sum is σ = 18665094398. Its totient is φ = 18665094396.

The previous prime is 18665094379. The next prime is 18665094403. The reversal of 18665094397 is 79349056681.

Together with previous prime (18665094379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18406077561 + 259016836 = 135669^2 + 16094^2 .

It is a cyclic number.

It is not a de Polignac number, because 18665094397 - 2¹⁵ = 18665061629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18665094197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9332547198 + 9332547199.

It is an arithmetic number, because the mean of its divisors is an integer number (9332547199).

Almost surely, 2^18665094397 is an apocalyptic number.

It is an amenable number.

18665094397 is a deficient number, since it is larger than the sum of its proper divisors (1).

18665094397 is an equidigital number, since it uses as much as digits as its factorization.

18665094397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9797760, while the sum is 58.

The spelling of 18665094397 in words is "eighteen billion, six hundred sixty-five million, ninety-four thousand, three hundred ninety-seven".