18916294923913 has 2 divisors, whose sum is σ = 18916294923914. Its totient is φ = 18916294923912.

The previous prime is 18916294923881. The next prime is 18916294923917. The reversal of 18916294923913 is 31932949261981.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11997543280009 + 6918751643904 = 3463747^2 + 2630352^2 .

It is a cyclic number.

It is not a de Polignac number, because 18916294923913 - 2⁵ = 18916294923881 is a prime.

It is not a weakly prime, because it can be changed into another prime (18916294923917) 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, 9458147461956 + 9458147461957.

It is an arithmetic number, because the mean of its divisors is an integer number (9458147461957).

Almost surely, 2^{18916294923913} is an apocalyptic number.

It is an amenable number.

18916294923913 is a deficient number, since it is larger than the sum of its proper divisors (1).

18916294923913 is an equidigital number, since it uses as much as digits as its factorization.

18916294923913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45349632, while the sum is 67.

The spelling of 18916294923913 in words is "eighteen trillion, nine hundred sixteen billion, two hundred ninety-four million, nine hundred twenty-three thousand, nine hundred thirteen".