26566649 has 2 divisors, whose sum is σ = 26566650. Its totient is φ = 26566648.

The previous prime is 26566627. The next prime is 26566663. The reversal of 26566649 is 94666562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20475625 + 6091024 = 4525^2 + 2468^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26566649 is a prime.

It is not a weakly prime, because it can be changed into another prime (26566619) 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 as a sum of consecutive naturals, namely, 13283324 + 13283325.

It is an arithmetic number, because the mean of its divisors is an integer number (13283325).

Almost surely, 2^26566649 is an apocalyptic number.

It is an amenable number.

26566649 is a deficient number, since it is larger than the sum of its proper divisors (1).

26566649 is an equidigital number, since it uses as much as digits as its factorization.

26566649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 466560, while the sum is 44.

The square root of 26566649 is about 5154.2845284288. The cubic root of 26566649 is about 298.3863321119.

The spelling of 26566649 in words is "twenty-six million, five hundred sixty-six thousand, six hundred forty-nine".