15728730015809 has 2 divisors, whose sum is σ = 15728730015810. Its totient is φ = 15728730015808.

The previous prime is 15728730015799. The next prime is 15728730015821. The reversal of 15728730015809 is 90851003782751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9934252978225 + 5794477037584 = 3151865^2 + 2407172^2 .

It is a cyclic number.

It is not a de Polignac number, because 15728730015809 - 2¹² = 15728730011713 is a prime.

It is not a weakly prime, because it can be changed into another prime (15728730011809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7864365007904 + 7864365007905.

It is an arithmetic number, because the mean of its divisors is an integer number (7864365007905).

Almost surely, 2^{15728730015809} is an apocalyptic number.

It is an amenable number.

15728730015809 is a deficient number, since it is larger than the sum of its proper divisors (1).

15728730015809 is an equidigital number, since it uses as much as digits as its factorization.

15728730015809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4233600, while the sum is 56.

The spelling of 15728730015809 in words is "fifteen trillion, seven hundred twenty-eight billion, seven hundred thirty million, fifteen thousand, eight hundred nine".