12739559549 has 2 divisors, whose sum is σ = 12739559550. Its totient is φ = 12739559548.

The previous prime is 12739559543. The next prime is 12739559587. The reversal of 12739559549 is 94595593721.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9153705625 + 3585853924 = 95675^2 + 59882^2 .

It is a cyclic number.

It is not a de Polignac number, because 12739559549 - 2²⁴ = 12722782333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12739559543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6369779774 + 6369779775.

It is an arithmetic number, because the mean of its divisors is an integer number (6369779775).

Almost surely, 2^12739559549 is an apocalyptic number.

It is an amenable number.

12739559549 is a deficient number, since it is larger than the sum of its proper divisors (1).

12739559549 is an equidigital number, since it uses as much as digits as its factorization.

12739559549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15309000, while the sum is 59.

The spelling of 12739559549 in words is "twelve billion, seven hundred thirty-nine million, five hundred fifty-nine thousand, five hundred forty-nine".