26662591 has 2 divisors, whose sum is σ = 26662592. Its totient is φ = 26662590.

The previous prime is 26662457. The next prime is 26662619. The reversal of 26662591 is 19526662.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26662591 - 2⁹ = 26662079 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26662591.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26662991) 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, 13331295 + 13331296.

It is an arithmetic number, because the mean of its divisors is an integer number (13331296).

Almost surely, 2^26662591 is an apocalyptic number.

26662591 is a deficient number, since it is larger than the sum of its proper divisors (1).

26662591 is an equidigital number, since it uses as much as digits as its factorization.

26662591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 37.

The square root of 26662591 is about 5163.5831551356. The cubic root of 26662591 is about 298.7450950684.

The spelling of 26662591 in words is "twenty-six million, six hundred sixty-two thousand, five hundred ninety-one".