866284885021 has 16 divisors (see below), whose sum is σ = 920971658880. Its totient is φ = 812018234880.

The previous prime is 866284885019. The next prime is 866284885049. The reversal of 866284885021 is 120588482668.

It is a cyclic number.

It is not a de Polignac number, because 866284885021 - 2¹ = 866284885019 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 (866284885001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4712881 + ... + 4893241.

It is an arithmetic number, because the mean of its divisors is an integer number (57560728680).

Almost surely, 2^866284885021 is an apocalyptic number.

It is an amenable number.

866284885021 is a deficient number, since it is larger than the sum of its proper divisors (54686773859).

866284885021 is a wasteful number, since it uses less digits than its factorization.

866284885021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181524.

The product of its (nonzero) digits is 11796480, while the sum is 58.

The spelling of 866284885021 in words is "eight hundred sixty-six billion, two hundred eighty-four million, eight hundred eighty-five thousand, twenty-one".