11566665 has 32 divisors (see below), whose sum is σ = 22435200. Its totient is φ = 5607360.

The previous prime is 11566663. The next prime is 11566673. The reversal of 11566665 is 56666511.

11566665 is digitally balanced in base 2, base 3 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11566665 - 2¹ = 11566663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11566663) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2410 + ... + 5379.

It is an arithmetic number, because the mean of its divisors is an integer number (701100).

Almost surely, 2^11566665 is an apocalyptic number.

11566665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11566665 is a deficient number, since it is larger than the sum of its proper divisors (10868535).

11566665 is a wasteful number, since it uses less digits than its factorization.

11566665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7814 (or 7808 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 11566665 is about 3400.9800058219. The cubic root of 11566665 is about 226.1531905757.

The spelling of 11566665 in words is "eleven million, five hundred sixty-six thousand, six hundred sixty-five".