26659 has 4 divisors (see below), whose sum is σ = 27216. Its totient is φ = 26104.

The previous prime is 26647. The next prime is 26669. The reversal of 26659 is 95662.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 26659 - 2⁵ = 26627 is a prime.

It is an Ulam number.

It is a Duffinian number.

26659 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (26669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199 + ... + 304.

It is an arithmetic number, because the mean of its divisors is an integer number (6804).

2²⁶⁶⁵⁹ is an apocalyptic number.

26659 is a deficient number, since it is larger than the sum of its proper divisors (557).

26659 is an equidigital number, since it uses as much as digits as its factorization.

26659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556.

The product of its digits is 3240, while the sum is 28.

The square root of 26659 is about 163.2758402214. The cubic root of 26659 is about 29.8731682496.

It can be divided in two parts, 266 and 59, that added together give a triangular number (325 = T₂₅).

The spelling of 26659 in words is "twenty-six thousand, six hundred fifty-nine".