11915665 has 16 divisors (see below), whose sum is σ = 15198480. Its totient is φ = 8951040.

The previous prime is 11915663. The next prime is 11915671. The reversal of 11915665 is 56651911.

11915665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 786769 + 11128896 = 887^2 + 3336^2 .

It is not a de Polignac number, because 11915665 - 2¹ = 11915663 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11915665.

It is not an unprimeable number, because it can be changed into a prime (11915663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4255 + ... + 6475.

It is an arithmetic number, because the mean of its divisors is an integer number (949905).

Almost surely, 2^11915665 is an apocalyptic number.

It is an amenable number.

11915665 is a deficient number, since it is larger than the sum of its proper divisors (3282815).

11915665 is a wasteful number, since it uses less digits than its factorization.

11915665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2292.

The product of its digits is 8100, while the sum is 34.

The square root of 11915665 is about 3451.9074437186. The cubic root of 11915665 is about 228.4052567332.

The spelling of 11915665 in words is "eleven million, nine hundred fifteen thousand, six hundred sixty-five".