26805867866 has 4 divisors (see below), whose sum is σ = 40208801802. Its totient is φ = 13402933932.

The previous prime is 26805867863. The next prime is 26805867871. The reversal of 26805867866 is 66876850862.

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

It can be written as a sum of positive squares in only one way, i.e., 20450430025 + 6355437841 = 143005^2 + 79721^2 .

It is a junction number, because it is equal to n+sod(n) for n = 26805867799 and 26805867808.

It is not an unprimeable number, because it can be changed into a prime (26805867863) 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, 6701466965 + ... + 6701466968.

Almost surely, 2^26805867866 is an apocalyptic number.

26805867866 is a deficient number, since it is larger than the sum of its proper divisors (13402933936).

26805867866 is a wasteful number, since it uses less digits than its factorization.

26805867866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13402933935.

The product of its (nonzero) digits is 46448640, while the sum is 62.

The spelling of 26805867866 in words is "twenty-six billion, eight hundred five million, eight hundred sixty-seven thousand, eight hundred sixty-six".