26780430866 has 16 divisors (see below), whose sum is σ = 46055992704. Its totient is φ = 11440656864.

The previous prime is 26780430863. The next prime is 26780430883. The reversal of 26780430866 is 66803408762.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (26780430863) 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 in 7 ways as a sum of consecutive naturals, for example, 3051350 + ... + 3060113.

It is an arithmetic number, because the mean of its divisors is an integer number (2878499544).

Almost surely, 2^26780430866 is an apocalyptic number.

26780430866 is a deficient number, since it is larger than the sum of its proper divisors (19275561838).

26780430866 is a wasteful number, since it uses less digits than its factorization.

26780430866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6111785.

The product of its (nonzero) digits is 2322432, while the sum is 50.

The spelling of 26780430866 in words is "twenty-six billion, seven hundred eighty million, four hundred thirty thousand, eight hundred sixty-six".