26840346649 has 2 divisors, whose sum is σ = 26840346650. Its totient is φ = 26840346648.

The previous prime is 26840346607. The next prime is 26840346661. The reversal of 26840346649 is 94664304862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23388196624 + 3452150025 = 152932^2 + 58755^2 .

It is a cyclic number.

It is not a de Polignac number, because 26840346649 - 2²¹ = 26838249497 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 26840346596 and 26840346605.

It is not a weakly prime, because it can be changed into another prime (26840346349) 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, 13420173324 + 13420173325.

It is an arithmetic number, because the mean of its divisors is an integer number (13420173325).

Almost surely, 2^26840346649 is an apocalyptic number.

It is an amenable number.

26840346649 is a deficient number, since it is larger than the sum of its proper divisors (1).

26840346649 is an equidigital number, since it uses as much as digits as its factorization.

26840346649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5971968, while the sum is 52.

The spelling of 26840346649 in words is "twenty-six billion, eight hundred forty million, three hundred forty-six thousand, six hundred forty-nine".