26645364673 has 2 divisors, whose sum is σ = 26645364674. Its totient is φ = 26645364672.

The previous prime is 26645364671. The next prime is 26645364689. The reversal of 26645364673 is 37646354662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26481703824 + 163660849 = 162732^2 + 12793^2 .

It is a cyclic number.

It is not a de Polignac number, because 26645364673 - 2¹ = 26645364671 is a prime.

Together with 26645364671, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 26645364673.

It is not a weakly prime, because it can be changed into another prime (26645364671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13322682336 + 13322682337.

It is an arithmetic number, because the mean of its divisors is an integer number (13322682337).

Almost surely, 2^26645364673 is an apocalyptic number.

It is an amenable number.

26645364673 is a deficient number, since it is larger than the sum of its proper divisors (1).

26645364673 is an equidigital number, since it uses as much as digits as its factorization.

26645364673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13063680, while the sum is 52.

The spelling of 26645364673 in words is "twenty-six billion, six hundred forty-five million, three hundred sixty-four thousand, six hundred seventy-three".