26856447799 has 4 divisors (see below), whose sum is σ = 28436238864. Its totient is φ = 25276656736.

The previous prime is 26856447781. The next prime is 26856447809. The reversal of 26856447799 is 99774465862.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 26856447799 - 2¹³ = 26856439607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26856447719) 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, 789895507 + ... + 789895540.

It is an arithmetic number, because the mean of its divisors is an integer number (7109059716).

Almost surely, 2^26856447799 is an apocalyptic number.

26856447799 is a deficient number, since it is larger than the sum of its proper divisors (1579791065).

26856447799 is a wasteful number, since it uses less digits than its factorization.

26856447799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1579791064.

The product of its digits is 182891520, while the sum is 67.

The spelling of 26856447799 in words is "twenty-six billion, eight hundred fifty-six million, four hundred forty-seven thousand, seven hundred ninety-nine".