26788661 has 2 divisors, whose sum is σ = 26788662. Its totient is φ = 26788660.

The previous prime is 26788633. The next prime is 26788667. The reversal of 26788661 is 16688762.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24196561 + 2592100 = 4919^2 + 1610^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26788661 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26788667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13394330 + 13394331.

It is an arithmetic number, because the mean of its divisors is an integer number (13394331).

Almost surely, 2^26788661 is an apocalyptic number.

It is an amenable number.

26788661 is a deficient number, since it is larger than the sum of its proper divisors (1).

26788661 is an equidigital number, since it uses as much as digits as its factorization.

26788661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 44.

The square root of 26788661 is about 5175.7763668845. The cubic root of 26788661 is about 299.2152117780.

The spelling of 26788661 in words is "twenty-six million, seven hundred eighty-eight thousand, six hundred sixty-one".