23666689 has 2 divisors, whose sum is σ = 23666690. Its totient is φ = 23666688.

The previous prime is 23666677. The next prime is 23666693. The reversal of 23666689 is 98666632.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23619600 + 47089 = 4860^2 + 217^2 .

It is a cyclic number.

It is not a de Polignac number, because 23666689 - 2⁷ = 23666561 is a prime.

It is a super-2 number, since 2×23666689² = 1120224336445442, which contains 22 as substring.

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (23661689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11833344 + 11833345.

It is an arithmetic number, because the mean of its divisors is an integer number (11833345).

It is a Proth number, since it is equal to 2889 ⋅ 2¹³ + 1 and 2889 < 2¹³.

Almost surely, 2^23666689 is an apocalyptic number.

It is an amenable number.

23666689 is a deficient number, since it is larger than the sum of its proper divisors (1).

23666689 is an equidigital number, since it uses as much as digits as its factorization.

23666689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 46.

The square root of 23666689 is about 4864.8421351571. The cubic root of 23666689 is about 287.1083574704.

The spelling of 23666689 in words is "twenty-three million, six hundred sixty-six thousand, six hundred eighty-nine".