26818646389 has 2 divisors, whose sum is σ = 26818646390. Its totient is φ = 26818646388.

The previous prime is 26818646383. The next prime is 26818646443. The reversal of 26818646389 is 98364681862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24528258225 + 2290388164 = 156615^2 + 47858^2 .

It is a cyclic number.

It is not a de Polignac number, because 26818646389 - 2¹⁹ = 26818122101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26818646383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13409323194 + 13409323195.

It is an arithmetic number, because the mean of its divisors is an integer number (13409323195).

Almost surely, 2^26818646389 is an apocalyptic number.

It is an amenable number.

26818646389 is a deficient number, since it is larger than the sum of its proper divisors (1).

26818646389 is an equidigital number, since it uses as much as digits as its factorization.

26818646389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23887872, while the sum is 61.

The spelling of 26818646389 in words is "twenty-six billion, eight hundred eighteen million, six hundred forty-six thousand, three hundred eighty-nine".