26866227217 has 4 divisors (see below), whose sum is σ = 26921394496. Its totient is φ = 26811059940.

The previous prime is 26866227187. The next prime is 26866227229. The reversal of 26866227217 is 71272266862.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 26866227217 - 2¹⁵ = 26866194449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26866227517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27582909 + ... + 27583882.

It is an arithmetic number, because the mean of its divisors is an integer number (6730348624).

Almost surely, 2^26866227217 is an apocalyptic number.

It is an amenable number.

26866227217 is a deficient number, since it is larger than the sum of its proper divisors (55167279).

26866227217 is an equidigital number, since it uses as much as digits as its factorization.

26866227217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55167278.

The product of its digits is 1354752, while the sum is 49.

The spelling of 26866227217 in words is "twenty-six billion, eight hundred sixty-six million, two hundred twenty-seven thousand, two hundred seventeen".