866826479220 has 96 divisors (see below), whose sum is σ = 2615216647680. Its totient is φ = 213258270720.

The previous prime is 866826479179. The next prime is 866826479227. The reversal of 866826479220 is 22974628668.

866826479220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866826479227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1162396 + ... + 1756364.

It is an arithmetic number, because the mean of its divisors is an integer number (27241840080).

Almost surely, 2^866826479220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866826479220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1307608323840).

866826479220 is an abundant number, since it is smaller than the sum of its proper divisors (1748390168460).

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

866826479220 is a wasteful number, since it uses less digits than its factorization.

866826479220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595865 (or 595863 counting only the distinct ones).

The product of its (nonzero) digits is 27869184, while the sum is 60.

The spelling of 866826479220 in words is "eight hundred sixty-six billion, eight hundred twenty-six million, four hundred seventy-nine thousand, two hundred twenty".