866621160000 has 1120 divisors, whose sum is σ = 3385053936000. Its totient is φ = 216732672000.

The previous prime is 866621159977. The next prime is 866621160007. The reversal of 866621160000 is 61126668.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (866621160007) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 3221639866 + ... + 3221640134.

Almost surely, 2^866621160000 is an apocalyptic number.

866621160000 is a gapful number since it is divisible by the number (80) 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 866621160000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1692526968000).

866621160000 is an abundant number, since it is smaller than the sum of its proper divisors (2518432776000).

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

866621160000 is a wasteful number, since it uses less digits than its factorization.

866621160000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486 (or 455 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

Adding to 866621160000 its reverse (61126668), we get a palindrome (866682286668).

The spelling of 866621160000 in words is "eight hundred sixty-six billion, six hundred twenty-one million, one hundred sixty thousand".