13663600749 has 20 divisors (see below), whose sum is σ = 20690670396. Its totient is φ = 8984281536.

The previous prime is 13663600747. The next prime is 13663600771. The reversal of 13663600749 is 94700636631.

13663600749 is a `hidden beast` number, since 1 + 3 + 6 + 636 + 0 + 0 + 7 + 4 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3453912900 + 10209687849 = 58770^2 + 101043^2 .

It is not a de Polignac number, because 13663600749 - 2¹ = 13663600747 is a prime.

It is a super-2 number, since 2×13663600749² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13663600747) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1149474 + ... + 1161299.

Almost surely, 2^13663600749 is an apocalyptic number.

It is an amenable number.

13663600749 is a deficient number, since it is larger than the sum of its proper divisors (7027069647).

13663600749 is an equidigital number, since it uses as much as digits as its factorization.

13663600749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2310858 (or 2310849 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 45.

The spelling of 13663600749 in words is "thirteen billion, six hundred sixty-three million, six hundred thousand, seven hundred forty-nine".