26646661 has 2 divisors, whose sum is σ = 26646662. Its totient is φ = 26646660.

The previous prime is 26646611. The next prime is 26646677. The reversal of 26646661 is 16664662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18438436 + 8208225 = 4294^2 + 2865^2 .

It is a cyclic number.

It is not a de Polignac number, because 26646661 - 2⁹ = 26646149 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26646661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26646611) 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 as a sum of consecutive naturals, namely, 13323330 + 13323331.

It is an arithmetic number, because the mean of its divisors is an integer number (13323331).

Almost surely, 2^26646661 is an apocalyptic number.

It is an amenable number.

26646661 is a deficient number, since it is larger than the sum of its proper divisors (1).

26646661 is an equidigital number, since it uses as much as digits as its factorization.

26646661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 37.

The square root of 26646661 is about 5162.0403911632. The cubic root of 26646661 is about 298.6855865050.

The spelling of 26646661 in words is "twenty-six million, six hundred forty-six thousand, six hundred sixty-one".