26668217 has 2 divisors, whose sum is σ = 26668218. Its totient is φ = 26668216.

The previous prime is 26668207. The next prime is 26668237. The reversal of 26668217 is 71286662.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26327161 + 341056 = 5131^2 + 584^2 .

It is a cyclic number.

It is not a de Polignac number, because 26668217 - 2⁸ = 26667961 is a prime.

It is a super-2 number, since 2×26668217² = 1422387595918178, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (26668207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13334108 + 13334109.

It is an arithmetic number, because the mean of its divisors is an integer number (13334109).

Almost surely, 2^26668217 is an apocalyptic number.

It is an amenable number.

26668217 is a deficient number, since it is larger than the sum of its proper divisors (1).

26668217 is an equidigital number, since it uses as much as digits as its factorization.

26668217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 38.

The square root of 26668217 is about 5164.1279031411. The cubic root of 26668217 is about 298.7661060509.

The spelling of 26668217 in words is "twenty-six million, six hundred sixty-eight thousand, two hundred seventeen".