11638566 has 20 divisors (see below), whose sum is σ = 26079372. Its totient is φ = 3879468.

The previous prime is 11638559. The next prime is 11638573. The reversal of 11638566 is 66583611.

It is a happy number.

11638566 is a `hidden beast` number, since 11 + 638 + 5 + 6 + 6 = 666.

11638566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (11638559) and next prime (11638573).

It is a self number, because there is not a number n which added to its sum of digits gives 11638566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 35760 + ... + 36083.

Almost surely, 2^11638566 is an apocalyptic number.

11638566 is an abundant number, since it is smaller than the sum of its proper divisors (14440806).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11638566 is an equidigital number, since it uses as much as digits as its factorization.

11638566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71857 (or 71848 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 11638566 is about 3411.5342589515. The cubic root of 11638566 is about 226.6208293510.

The spelling of 11638566 in words is "eleven million, six hundred thirty-eight thousand, five hundred sixty-six".