11665573 has 2 divisors, whose sum is σ = 11665574. Its totient is φ = 11665572.

The previous prime is 11665561. The next prime is 11665597. The reversal of 11665573 is 37556611.

11665573 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9253764 + 2411809 = 3042^2 + 1553^2 .

It is an emirp because it is prime and its reverse (37556611) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11665573 - 2²¹ = 9568421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11665523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5832786 + 5832787.

It is an arithmetic number, because the mean of its divisors is an integer number (5832787).

Almost surely, 2^11665573 is an apocalyptic number.

It is an amenable number.

11665573 is a deficient number, since it is larger than the sum of its proper divisors (1).

11665573 is an equidigital number, since it uses as much as digits as its factorization.

11665573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18900, while the sum is 34.

The square root of 11665573 is about 3415.4901551607. The cubic root of 11665573 is about 226.7959832544.

The spelling of 11665573 in words is "eleven million, six hundred sixty-five thousand, five hundred seventy-three".