15688312609 has 2 divisors, whose sum is σ = 15688312610. Its totient is φ = 15688312608.

The previous prime is 15688312603. The next prime is 15688312649. The reversal of 15688312609 is 90621388651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10851805584 + 4836507025 = 104172^2 + 69545^2 .

It is an emirp because it is prime and its reverse (90621388651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15688312609 - 2²⁵ = 15654758177 is a prime.

It is a super-2 number, since 2×15688312609² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15688312603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7844156304 + 7844156305.

It is an arithmetic number, because the mean of its divisors is an integer number (7844156305).

Almost surely, 2^15688312609 is an apocalyptic number.

It is an amenable number.

15688312609 is a deficient number, since it is larger than the sum of its proper divisors (1).

15688312609 is an equidigital number, since it uses as much as digits as its factorization.

15688312609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622080, while the sum is 49.

The spelling of 15688312609 in words is "fifteen billion, six hundred eighty-eight million, three hundred twelve thousand, six hundred nine".