866422821888 has 1232 divisors, whose sum is σ = 3047120312320. Its totient is φ = 243799621632.

The previous prime is 866422821883. The next prime is 866422821997. The reversal of 866422821888 is 888128224668.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866422821883) by changing a digit.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 6822226881 + ... + 6822227007.

Almost surely, 2^866422821888 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 866422821888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1523560156160).

866422821888 is an abundant number, since it is smaller than the sum of its proper divisors (2180697490432).

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

866422821888 is a wasteful number, since it uses less digits than its factorization.

866422821888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234 (or 201 counting only the distinct ones).

The product of its digits is 37748736, while the sum is 63.

The spelling of 866422821888 in words is "eight hundred sixty-six billion, four hundred twenty-two million, eight hundred twenty-one thousand, eight hundred eighty-eight".