26311779217 has 2 divisors, whose sum is σ = 26311779218. Its totient is φ = 26311779216.

The previous prime is 26311779211. The next prime is 26311779227. The reversal of 26311779217 is 71297711362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13937219136 + 12374560081 = 118056^2 + 111241^2 .

It is a cyclic number.

It is not a de Polignac number, because 26311779217 - 2³ = 26311779209 is a prime.

It is not a weakly prime, because it can be changed into another prime (26311779211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13155889608 + 13155889609.

It is an arithmetic number, because the mean of its divisors is an integer number (13155889609).

Almost surely, 2^26311779217 is an apocalyptic number.

It is an amenable number.

26311779217 is a deficient number, since it is larger than the sum of its proper divisors (1).

26311779217 is an equidigital number, since it uses as much as digits as its factorization.

26311779217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 222264, while the sum is 46.

The spelling of 26311779217 in words is "twenty-six billion, three hundred eleven million, seven hundred seventy-nine thousand, two hundred seventeen".