16433321073509 has 2 divisors, whose sum is σ = 16433321073510. Its totient is φ = 16433321073508.

The previous prime is 16433321073451. The next prime is 16433321073523. The reversal of 16433321073509 is 90537012333461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15057333422884 + 1375987650625 = 3880378^2 + 1173025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16433321073509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16433321073539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8216660536754 + 8216660536755.

It is an arithmetic number, because the mean of its divisors is an integer number (8216660536755).

Almost surely, 2^{16433321073509} is an apocalyptic number.

It is an amenable number.

16433321073509 is a deficient number, since it is larger than the sum of its proper divisors (1).

16433321073509 is an equidigital number, since it uses as much as digits as its factorization.

16433321073509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1224720, while the sum is 47.

The spelling of 16433321073509 in words is "sixteen trillion, four hundred thirty-three billion, three hundred twenty-one million, seventy-three thousand, five hundred nine".