26656591 has 4 divisors (see below), whose sum is σ = 28707112. Its totient is φ = 24606072.

The previous prime is 26656579. The next prime is 26656631. The reversal of 26656591 is 19565662.

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 26656591 - 2⁷ = 26656463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26656571) 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 in 3 ways as a sum of consecutive naturals, for example, 1025241 + ... + 1025266.

It is an arithmetic number, because the mean of its divisors is an integer number (7176778).

Almost surely, 2^26656591 is an apocalyptic number.

26656591 is a deficient number, since it is larger than the sum of its proper divisors (2050521).

26656591 is a wasteful number, since it uses less digits than its factorization.

26656591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2050520.

The product of its digits is 97200, while the sum is 40.

The square root of 26656591 is about 5163.0021305438. The cubic root of 26656591 is about 298.7226840801.

The spelling of 26656591 in words is "twenty-six million, six hundred fifty-six thousand, five hundred ninety-one".