13608611865 has 12 divisors (see below), whose sum is σ = 23588260644. Its totient is φ = 7257926304.

The previous prime is 13608611837. The next prime is 13608611867. The reversal of 13608611865 is 56811680631.

It can be written as a sum of positive squares in 2 ways, for example, as 7643830041 + 5964781824 = 87429^2 + 77232^2 .

It is not a de Polignac number, because 13608611865 - 2¹² = 13608607769 is a prime.

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 Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 302413597 = 13608611865 / (1 + 3 + 6 + 0 + 8 + 6 + 1 + 1 + 8 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 13608611865.

It is not an unprimeable number, because it can be changed into a prime (13608611867) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 151206754 + ... + 151206843.

It is an arithmetic number, because the mean of its divisors is an integer number (1965688387).

Almost surely, 2^13608611865 is an apocalyptic number.

13608611865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13608611865 is a deficient number, since it is larger than the sum of its proper divisors (9979648779).

13608611865 is a wasteful number, since it uses less digits than its factorization.

13608611865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302413608 (or 302413605 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The spelling of 13608611865 in words is "thirteen billion, six hundred eight million, six hundred eleven thousand, eight hundred sixty-five".