13517278849 has 2 divisors, whose sum is σ = 13517278850. Its totient is φ = 13517278848.

The previous prime is 13517278847. The next prime is 13517278861. The reversal of 13517278849 is 94887271531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12725419249 + 791859600 = 112807^2 + 28140^2 .

It is a cyclic number.

It is not a de Polignac number, because 13517278849 - 2¹ = 13517278847 is a prime.

Together with 13517278847, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 13517278849.

It is not a weakly prime, because it can be changed into another prime (13517278847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6758639424 + 6758639425.

It is an arithmetic number, because the mean of its divisors is an integer number (6758639425).

Almost surely, 2^13517278849 is an apocalyptic number.

It is an amenable number.

13517278849 is a deficient number, since it is larger than the sum of its proper divisors (1).

13517278849 is an equidigital number, since it uses as much as digits as its factorization.

13517278849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3386880, while the sum is 55.

The spelling of 13517278849 in words is "thirteen billion, five hundred seventeen million, two hundred seventy-eight thousand, eight hundred forty-nine".