11656645 has 64 divisors (see below), whose sum is σ = 20030976. Its totient is φ = 6266880.

The previous prime is 11656639. The next prime is 11656649. The reversal of 11656645 is 54665611.

11656645 = 221² + 222² + ... + 357².

It is a happy number.

It is not a de Polignac number, because 11656645 - 2¹¹ = 11654597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11656645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11656649) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 85017 + ... + 85153.

It is an arithmetic number, because the mean of its divisors is an integer number (312984).

Almost surely, 2^11656645 is an apocalyptic number.

It is an amenable number.

11656645 is a deficient number, since it is larger than the sum of its proper divisors (8374331).

11656645 is a wasteful number, since it uses less digits than its factorization.

11656645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190.

The product of its digits is 21600, while the sum is 34.

The square root of 11656645 is about 3414.1829183569. The cubic root of 11656645 is about 226.7381106489.

It can be divided in two parts, 116566 and 45, that added together give a palindrome (116611).

The spelling of 11656645 in words is "eleven million, six hundred fifty-six thousand, six hundred forty-five".