16720515433 has 2 divisors, whose sum is σ = 16720515434. Its totient is φ = 16720515432.

The previous prime is 16720515421. The next prime is 16720515443. The reversal of 16720515433 is 33451502761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12418204969 + 4302310464 = 111437^2 + 65592^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16720515433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16720515392 and 16720515401.

It is not a weakly prime, because it can be changed into another prime (16720515443) 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, 8360257716 + 8360257717.

It is an arithmetic number, because the mean of its divisors is an integer number (8360257717).

Almost surely, 2^16720515433 is an apocalyptic number.

It is an amenable number.

16720515433 is a deficient number, since it is larger than the sum of its proper divisors (1).

16720515433 is an equidigital number, since it uses as much as digits as its factorization.

16720515433 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75600, while the sum is 37.

The spelling of 16720515433 in words is "sixteen billion, seven hundred twenty million, five hundred fifteen thousand, four hundred thirty-three".