13168663649 has 2 divisors, whose sum is σ = 13168663650. Its totient is φ = 13168663648.

The previous prime is 13168663637. The next prime is 13168663663. The reversal of 13168663649 is 94636686131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13125826624 + 42837025 = 114568^2 + 6545^2 .

It is a cyclic number.

It is not a de Polignac number, because 13168663649 - 2⁴ = 13168663633 is a prime.

It is a super-4 number, since 4×13168663649⁴ (a number of 42 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13168663649.

It is not a weakly prime, because it can be changed into another prime (13168663619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6584331824 + 6584331825.

It is an arithmetic number, because the mean of its divisors is an integer number (6584331825).

Almost surely, 2^13168663649 is an apocalyptic number.

It is an amenable number.

13168663649 is a deficient number, since it is larger than the sum of its proper divisors (1).

13168663649 is an equidigital number, since it uses as much as digits as its factorization.

13168663649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3359232, while the sum is 53.

The spelling of 13168663649 in words is "thirteen billion, one hundred sixty-eight million, six hundred sixty-three thousand, six hundred forty-nine".