26919444217 has 2 divisors, whose sum is σ = 26919444218. Its totient is φ = 26919444216.

The previous prime is 26919444137. The next prime is 26919444263. The reversal of 26919444217 is 71244491962.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26907809296 + 11634921 = 164036^2 + 3411^2 .

It is a cyclic number.

It is not a de Polignac number, because 26919444217 - 2⁷ = 26919444089 is a prime.

It is not a weakly prime, because it can be changed into another prime (26919474217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13459722108 + 13459722109.

It is an arithmetic number, because the mean of its divisors is an integer number (13459722109).

Almost surely, 2^26919444217 is an apocalyptic number.

It is an amenable number.

26919444217 is a deficient number, since it is larger than the sum of its proper divisors (1).

26919444217 is an equidigital number, since it uses as much as digits as its factorization.

26919444217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 49.

The spelling of 26919444217 in words is "twenty-six billion, nine hundred nineteen million, four hundred forty-four thousand, two hundred seventeen".