26566561 has 8 divisors (see below), whose sum is σ = 31068224. Its totient is φ = 22241520.

The previous prime is 26566559. The next prime is 26566571. The reversal of 26566561 is 16566562.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 26566561 - 2¹ = 26566559 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 26566561.

It is not an unprimeable number, because it can be changed into a prime (26566511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43830 + ... + 44431.

It is an arithmetic number, because the mean of its divisors is an integer number (3883528).

Almost surely, 2^26566561 is an apocalyptic number.

It is an amenable number.

26566561 is a deficient number, since it is larger than the sum of its proper divisors (4501663).

26566561 is an equidigital number, since it uses as much as digits as its factorization.

26566561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88311.

The product of its digits is 64800, while the sum is 37.

The square root of 26566561 is about 5154.2759918344. The cubic root of 26566561 is about 298.3860026509.

Subtracting from 26566561 its reverse (16566562), we obtain a palindrome (9999999).

The spelling of 26566561 in words is "twenty-six million, five hundred sixty-six thousand, five hundred sixty-one".