866286445891 has 16 divisors (see below), whose sum is σ = 900634825728. Its totient is φ = 832346704800.

The previous prime is 866286445883. The next prime is 866286445933. The reversal of 866286445891 is 198544682668.

It is a cyclic number.

It is not a de Polignac number, because 866286445891 - 2³ = 866286445883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866286445811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6174996 + ... + 6313726.

It is an arithmetic number, because the mean of its divisors is an integer number (56289676608).

Almost surely, 2^866286445891 is an apocalyptic number.

866286445891 is a deficient number, since it is larger than the sum of its proper divisors (34348379837).

866286445891 is a wasteful number, since it uses less digits than its factorization.

866286445891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140202.

The product of its digits is 159252480, while the sum is 67.

The spelling of 866286445891 in words is "eight hundred sixty-six billion, two hundred eighty-six million, four hundred forty-five thousand, eight hundred ninety-one".