26557 has 2 divisors, whose sum is σ = 26558. Its totient is φ = 26556.

The previous prime is 26539. The next prime is 26561. The reversal of 26557 is 75562.

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., 22201 + 4356 = 149^2 + 66^2 .

It is a cyclic number.

It is not a de Polignac number, because 26557 - 2¹¹ = 24509 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26597) 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, 13278 + 13279.

It is an arithmetic number, because the mean of its divisors is an integer number (13279).

2²⁶⁵⁵⁷ is an apocalyptic number.

It is an amenable number.

26557 is a deficient number, since it is larger than the sum of its proper divisors (1).

26557 is an equidigital number, since it uses as much as digits as its factorization.

26557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2100, while the sum is 25.

The square root of 26557 is about 162.9631860268. The cubic root of 26557 is about 29.8350203125.

It can be divided in two parts, 2655 and 7, that added together give a palindrome (2662).

The spelling of 26557 in words is "twenty-six thousand, five hundred fifty-seven".