15688312649 has 2 divisors, whose sum is σ = 15688312650. Its totient is φ = 15688312648.

The previous prime is 15688312609. The next prime is 15688312697. The reversal of 15688312649 is 94621388651.

15688312649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15642004624 + 46308025 = 125068^2 + 6805^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15688312649 is a prime.

It is a super-2 number, since 2×15688312649² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 15688312649.

It is not a weakly prime, because it can be changed into another prime (15688312609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7844156324 + 7844156325.

It is an arithmetic number, because the mean of its divisors is an integer number (7844156325).

Almost surely, 2^15688312649 is an apocalyptic number.

It is an amenable number.

15688312649 is a deficient number, since it is larger than the sum of its proper divisors (1).

15688312649 is an equidigital number, since it uses as much as digits as its factorization.

15688312649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2488320, while the sum is 53.

The spelling of 15688312649 in words is "fifteen billion, six hundred eighty-eight million, three hundred twelve thousand, six hundred forty-nine".