23066561 has 4 divisors (see below), whose sum is σ = 26361792. Its totient is φ = 19771332.

The previous prime is 23066557. The next prime is 23066587. The reversal of 23066561 is 16566032.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 23066561 - 2² = 23066557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (23066591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1647605 + ... + 1647618.

It is an arithmetic number, because the mean of its divisors is an integer number (6590448).

Almost surely, 2^23066561 is an apocalyptic number.

It is an amenable number.

23066561 is a deficient number, since it is larger than the sum of its proper divisors (3295231).

23066561 is an equidigital number, since it uses as much as digits as its factorization.

23066561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3295230.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 23066561 is about 4802.7659738946. The cubic root of 23066561 is about 284.6607680191.

The spelling of 23066561 in words is "twenty-three million, sixty-six thousand, five hundred sixty-one".