866279972563 has 2 divisors, whose sum is σ = 866279972564. Its totient is φ = 866279972562.

The previous prime is 866279972521. The next prime is 866279972699. The reversal of 866279972563 is 365279972668.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-866279972563 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 866279972492 and 866279972501.

It is not a weakly prime, because it can be changed into another prime (866279972263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433139986281 + 433139986282.

It is an arithmetic number, because the mean of its divisors is an integer number (433139986282).

Almost surely, 2^866279972563 is an apocalyptic number.

866279972563 is a deficient number, since it is larger than the sum of its proper divisors (1).

866279972563 is an equidigital number, since it uses as much as digits as its factorization.

866279972563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 411505920, while the sum is 70.

The spelling of 866279972563 in words is "eight hundred sixty-six billion, two hundred seventy-nine million, nine hundred seventy-two thousand, five hundred sixty-three".