16550745509 has 2 divisors, whose sum is σ = 16550745510. Its totient is φ = 16550745508.

The previous prime is 16550745503. The next prime is 16550745529. The reversal of 16550745509 is 90554705561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15779128225 + 771617284 = 125615^2 + 27778^2 .

It is a cyclic number.

It is not a de Polignac number, because 16550745509 - 2²⁴ = 16533968293 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16550745503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8275372754 + 8275372755.

It is an arithmetic number, because the mean of its divisors is an integer number (8275372755).

Almost surely, 2^16550745509 is an apocalyptic number.

It is an amenable number.

16550745509 is a deficient number, since it is larger than the sum of its proper divisors (1).

16550745509 is an equidigital number, since it uses as much as digits as its factorization.

16550745509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 945000, while the sum is 47.

The spelling of 16550745509 in words is "sixteen billion, five hundred fifty million, seven hundred forty-five thousand, five hundred nine".