866178646608 has 320 divisors, whose sum is σ = 2553546276864. Its totient is φ = 250713792000.

The previous prime is 866178646591. The next prime is 866178646667. The reversal of 866178646608 is 806646871668.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 204719853 + ... + 204724083.

Almost surely, 2^866178646608 is an apocalyptic number.

866178646608 is a gapful number since it is divisible by the number (88) 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 866178646608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1276773138432).

866178646608 is an abundant number, since it is smaller than the sum of its proper divisors (1687367630256).

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

866178646608 is a wasteful number, since it uses less digits than its factorization.

866178646608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4494 (or 4488 counting only the distinct ones).

The product of its (nonzero) digits is 111476736, while the sum is 66.

The spelling of 866178646608 in words is "eight hundred sixty-six billion, one hundred seventy-eight million, six hundred forty-six thousand, six hundred eight".