11665645 has 4 divisors (see below), whose sum is σ = 13998780. Its totient is φ = 9332512.

The previous prime is 11665637. The next prime is 11665649. The reversal of 11665645 is 54656611.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2653641 + 9012004 = 1629^2 + 3002^2 .

It is a cyclic number.

It is not a de Polignac number, because 11665645 - 2³ = 11665637 is a prime.

It is a super-3 number, since 3×11665645³ (a number of 22 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11665645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11665649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1166560 + ... + 1166569.

It is an arithmetic number, because the mean of its divisors is an integer number (3499695).

Almost surely, 2^11665645 is an apocalyptic number.

It is an amenable number.

11665645 is a deficient number, since it is larger than the sum of its proper divisors (2333135).

11665645 is an equidigital number, since it uses as much as digits as its factorization.

11665645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2333134.

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

The square root of 11665645 is about 3415.5006953593. The cubic root of 11665645 is about 226.7964498489.

It can be divided in two parts, 1166564 and 5, that multiplied together give a triangular number (5832820 = T₃₄₁₅).

The spelling of 11665645 in words is "eleven million, six hundred sixty-five thousand, six hundred forty-five".