18956317297 has 2 divisors, whose sum is σ = 18956317298. Its totient is φ = 18956317296.

The previous prime is 18956317249. The next prime is 18956317319. The reversal of 18956317297 is 79271365981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18771466081 + 184851216 = 137009^2 + 13596^2 .

It is an emirp because it is prime and its reverse (79271365981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18956317297 - 2¹⁹ = 18955793009 is a prime.

It is not a weakly prime, because it can be changed into another prime (18956317097) 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, 9478158648 + 9478158649.

It is an arithmetic number, because the mean of its divisors is an integer number (9478158649).

Almost surely, 2^18956317297 is an apocalyptic number.

It is an amenable number.

18956317297 is a deficient number, since it is larger than the sum of its proper divisors (1).

18956317297 is an equidigital number, since it uses as much as digits as its factorization.

18956317297 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5715360, while the sum is 58.

The spelling of 18956317297 in words is "eighteen billion, nine hundred fifty-six million, three hundred seventeen thousand, two hundred ninety-seven".