16394775989 has 2 divisors, whose sum is σ = 16394775990. Its totient is φ = 16394775988.

The previous prime is 16394775931. The next prime is 16394775997. The reversal of 16394775989 is 98957749361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13655091025 + 2739684964 = 116855^2 + 52342^2 .

It is a cyclic number.

It is not a de Polignac number, because 16394775989 - 2¹² = 16394771893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16394775919) 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, 8197387994 + 8197387995.

It is an arithmetic number, because the mean of its divisors is an integer number (8197387995).

Almost surely, 2^16394775989 is an apocalyptic number.

It is an amenable number.

16394775989 is a deficient number, since it is larger than the sum of its proper divisors (1).

16394775989 is an equidigital number, since it uses as much as digits as its factorization.

16394775989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 102876480, while the sum is 68.

The spelling of 16394775989 in words is "sixteen billion, three hundred ninety-four million, seven hundred seventy-five thousand, nine hundred eighty-nine".