26560661 has 4 divisors (see below), whose sum is σ = 27208524. Its totient is φ = 25912800.

The previous prime is 26560657. The next prime is 26560663. The reversal of 26560661 is 16606562.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5262436 + 21298225 = 2294^2 + 4615^2 .

It is a cyclic number.

It is not a de Polignac number, because 26560661 - 2² = 26560657 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 (26560663) 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, 323870 + ... + 323951.

It is an arithmetic number, because the mean of its divisors is an integer number (6802131).

Almost surely, 2^26560661 is an apocalyptic number.

It is an amenable number.

26560661 is a deficient number, since it is larger than the sum of its proper divisors (647863).

26560661 is an equidigital number, since it uses as much as digits as its factorization.

26560661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647862.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 26560661 is about 5153.7036197282. The cubic root of 26560661 is about 298.3639121270.

The spelling of 26560661 in words is "twenty-six million, five hundred sixty thousand, six hundred sixty-one".