866128338064 has 80 divisors (see below), whose sum is σ = 1934101566720. Its totient is φ = 372031278080.

The previous prime is 866128338059. The next prime is 866128338083. The reversal of 866128338064 is 460833821668.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 866128337996 and 866128338014.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1565389 + ... + 2045164.

It is an arithmetic number, because the mean of its divisors is an integer number (24176269584).

Almost surely, 2^866128338064 is an apocalyptic number.

It is an amenable number.

866128338064 is an abundant number, since it is smaller than the sum of its proper divisors (1067973228656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

866128338064 is a wasteful number, since it uses less digits than its factorization.

866128338064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3610648 (or 3610642 counting only the distinct ones).

The product of its (nonzero) digits is 7962624, while the sum is 55.

The spelling of 866128338064 in words is "eight hundred sixty-six billion, one hundred twenty-eight million, three hundred thirty-eight thousand, sixty-four".