26599561 has 2 divisors, whose sum is σ = 26599562. Its totient is φ = 26599560.

The previous prime is 26599549. The next prime is 26599567. The reversal of 26599561 is 16599562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22619536 + 3980025 = 4756^2 + 1995^2 .

It is a cyclic number.

It is not a de Polignac number, because 26599561 - 2¹¹ = 26597513 is a prime.

It is not a weakly prime, because it can be changed into another prime (26599567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13299780 + 13299781.

It is an arithmetic number, because the mean of its divisors is an integer number (13299781).

Almost surely, 2^26599561 is an apocalyptic number.

It is an amenable number.

26599561 is a deficient number, since it is larger than the sum of its proper divisors (1).

26599561 is an equidigital number, since it uses as much as digits as its factorization.

26599561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145800, while the sum is 43.

The square root of 26599561 is about 5157.4762238909. The cubic root of 26599561 is about 298.5094995513.

Subtracting from 26599561 its reverse (16599562), we obtain a palindrome (9999999).

The spelling of 26599561 in words is "twenty-six million, five hundred ninety-nine thousand, five hundred sixty-one".