26608561 has 4 divisors (see below), whose sum is σ = 30409792. Its totient is φ = 22807332.

The previous prime is 26608559. The next prime is 26608567. The reversal of 26608561 is 16580662.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 26608561 - 2¹ = 26608559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26608567) 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 in 3 ways as a sum of consecutive naturals, for example, 1900605 + ... + 1900618.

It is an arithmetic number, because the mean of its divisors is an integer number (7602448).

Almost surely, 2^26608561 is an apocalyptic number.

It is an amenable number.

26608561 is a deficient number, since it is larger than the sum of its proper divisors (3801231).

26608561 is an equidigital number, since it uses as much as digits as its factorization.

26608561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3801230.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 26608561 is about 5158.3486698749. The cubic root of 26608561 is about 298.5431627955.

The spelling of 26608561 in words is "twenty-six million, six hundred eight thousand, five hundred sixty-one".