866836656 has 180 divisors, whose sum is σ = 2888649192. Its totient is φ = 241823232.

The previous prime is 866836631. The next prime is 866836679. The reversal of 866836656 is 656638668.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 301980 + ... + 304836.

Almost surely, 2^866836656 is an apocalyptic number.

866836656 is a gapful number since it is divisible by the number (86) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866836656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1444324596).

866836656 is an abundant number, since it is smaller than the sum of its proper divisors (2021812536).

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

866836656 is a wasteful number, since it uses less digits than its factorization.

866836656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2928 (or 2912 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 54.

The square root of 866836656 is about 29442.0898714748. The cubic root of 866836656 is about 953.4818329753.

It can be divided in two parts, 86683 and 6656, that added together give a palindrome (93339).

The spelling of 866836656 in words is "eight hundred sixty-six million, eight hundred thirty-six thousand, six hundred fifty-six".