11808607565 has 4 divisors (see below), whose sum is σ = 14170329084. Its totient is φ = 9446886048.

The previous prime is 11808607553. The next prime is 11808607589. The reversal of 11808607565 is 56570680811.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56570680811 = 131011 ⋅431801.

It can be written as a sum of positive squares in 2 ways, for example, as 1367446441 + 10441161124 = 36979^2 + 102182^2 .

It is a cyclic number.

It is not a de Polignac number, because 11808607565 - 2¹⁸ = 11808345421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1180860752 + ... + 1180860761.

It is an arithmetic number, because the mean of its divisors is an integer number (3542582271).

Almost surely, 2^11808607565 is an apocalyptic number.

It is an amenable number.

11808607565 is a deficient number, since it is larger than the sum of its proper divisors (2361721519).

11808607565 is an equidigital number, since it uses as much as digits as its factorization.

11808607565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2361721518.

The product of its (nonzero) digits is 403200, while the sum is 47.

The spelling of 11808607565 in words is "eleven billion, eight hundred eight million, six hundred seven thousand, five hundred sixty-five".