16506423389 has 2 divisors, whose sum is σ = 16506423390. Its totient is φ = 16506423388.

The previous prime is 16506423383. The next prime is 16506423391. The reversal of 16506423389 is 98332460561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15708360889 + 798062500 = 125333^2 + 28250^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16506423389 is a prime.

Together with 16506423391, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16506423383) 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, 8253211694 + 8253211695.

It is an arithmetic number, because the mean of its divisors is an integer number (8253211695).

Almost surely, 2^16506423389 is an apocalyptic number.

It is an amenable number.

16506423389 is a deficient number, since it is larger than the sum of its proper divisors (1).

16506423389 is an equidigital number, since it uses as much as digits as its factorization.

16506423389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 933120, while the sum is 47.

The spelling of 16506423389 in words is "sixteen billion, five hundred six million, four hundred twenty-three thousand, three hundred eighty-nine".