866647385166 has 32 divisors (see below), whose sum is σ = 1734709104000. Its totient is φ = 288646823520.

The previous prime is 866647385119. The next prime is 866647385173. The reversal of 866647385166 is 661583746668.

It is a junction number, because it is equal to n+sod(n) for n = 866647385097 and 866647385106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69098856 + ... + 69111396.

It is an arithmetic number, because the mean of its divisors is an integer number (54209659500).

Almost surely, 2^866647385166 is an apocalyptic number.

866647385166 is an abundant number, since it is smaller than the sum of its proper divisors (868061718834).

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

866647385166 is a wasteful number, since it uses less digits than its factorization.

866647385166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21024.

The product of its digits is 209018880, while the sum is 66.

The spelling of 866647385166 in words is "eight hundred sixty-six billion, six hundred forty-seven million, three hundred eighty-five thousand, one hundred sixty-six".