14445728509 has 2 divisors, whose sum is σ = 14445728510. Its totient is φ = 14445728508.

The previous prime is 14445728503. The next prime is 14445728513. The reversal of 14445728509 is 90582754441.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14309422884 + 136305625 = 119622^2 + 11675^2 .

It is a cyclic number.

It is not a de Polignac number, because 14445728509 - 2⁵ = 14445728477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (14445728503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7222864254 + 7222864255.

It is an arithmetic number, because the mean of its divisors is an integer number (7222864255).

Almost surely, 2^14445728509 is an apocalyptic number.

It is an amenable number.

14445728509 is a deficient number, since it is larger than the sum of its proper divisors (1).

14445728509 is an equidigital number, since it uses as much as digits as its factorization.

14445728509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1612800, while the sum is 49.

The spelling of 14445728509 in words is "fourteen billion, four hundred forty-five million, seven hundred twenty-eight thousand, five hundred nine".