16396918393 has 2 divisors, whose sum is σ = 16396918394. Its totient is φ = 16396918392.

The previous prime is 16396918309. The next prime is 16396918397. The reversal of 16396918393 is 39381969361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14750831209 + 1646087184 = 121453^2 + 40572^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16396918393 is a prime.

It is a super-3 number, since 3×16396918393³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (16396918397) 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, 8198459196 + 8198459197.

It is an arithmetic number, because the mean of its divisors is an integer number (8198459197).

Almost surely, 2^16396918393 is an apocalyptic number.

It is an amenable number.

16396918393 is a deficient number, since it is larger than the sum of its proper divisors (1).

16396918393 is an equidigital number, since it uses as much as digits as its factorization.

16396918393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5668704, while the sum is 58.

The spelling of 16396918393 in words is "sixteen billion, three hundred ninety-six million, nine hundred eighteen thousand, three hundred ninety-three".