866164266 has 112 divisors (see below), whose sum is σ = 2167287840. Its totient is φ = 257268960.

The previous prime is 866164259. The next prime is 866164283. The reversal of 866164266 is 662461668.

866164266 is a `hidden beast` number, since 8 + 6 + 616 + 4 + 26 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 849505 + ... + 850523.

Almost surely, 2^866164266 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866164266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1083643920).

866164266 is an abundant number, since it is smaller than the sum of its proper divisors (1301123574).

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

866164266 is a wasteful number, since it uses less digits than its factorization.

866164266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1103 (or 1088 counting only the distinct ones).

The product of its digits is 497664, while the sum is 45.

The square root of 866164266 is about 29430.6687997402. The cubic root of 866164266 is about 953.2352361557.

It can be divided in two parts, 8661 and 64266, that added together give a palindrome (72927).

The spelling of 866164266 in words is "eight hundred sixty-six million, one hundred sixty-four thousand, two hundred sixty-six".