26746511821 has 2 divisors, whose sum is σ = 26746511822. Its totient is φ = 26746511820.

The previous prime is 26746511809. The next prime is 26746511843. The reversal of 26746511821 is 12811564762.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17475518025 + 9270993796 = 132195^2 + 96286^2 .

It is a cyclic number.

It is not a de Polignac number, because 26746511821 - 2¹³ = 26746503629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26746511881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13373255910 + 13373255911.

It is an arithmetic number, because the mean of its divisors is an integer number (13373255911).

Almost surely, 2^26746511821 is an apocalyptic number.

It is an amenable number.

26746511821 is a deficient number, since it is larger than the sum of its proper divisors (1).

26746511821 is an equidigital number, since it uses as much as digits as its factorization.

26746511821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 161280, while the sum is 43.

The spelling of 26746511821 in words is "twenty-six billion, seven hundred forty-six million, five hundred eleven thousand, eight hundred twenty-one".