13649560817 has 2 divisors, whose sum is σ = 13649560818. Its totient is φ = 13649560816.

The previous prime is 13649560811. The next prime is 13649560853. The reversal of 13649560817 is 71806594631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13032733921 + 616826896 = 114161^2 + 24836^2 .

It is an emirp because it is prime and its reverse (71806594631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13649560817 - 2⁶ = 13649560753 is a prime.

It is not a weakly prime, because it can be changed into another prime (13649560811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6824780408 + 6824780409.

It is an arithmetic number, because the mean of its divisors is an integer number (6824780409).

Almost surely, 2^13649560817 is an apocalyptic number.

It is an amenable number.

13649560817 is a deficient number, since it is larger than the sum of its proper divisors (1).

13649560817 is an equidigital number, since it uses as much as digits as its factorization.

13649560817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The spelling of 13649560817 in words is "thirteen billion, six hundred forty-nine million, five hundred sixty thousand, eight hundred seventeen".