866222809088 has 378 divisors, whose sum is σ = 2201589693459. Its totient is φ = 339648970752.

The previous prime is 866222809043. The next prime is 866222809103. The reversal of 866222809088 is 880908222668.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 5 ways, for example, as 56165208064 + 810057601024 = 236992^2 + 900032^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=658112.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 7665688520 + ... + 7665688632.

Almost surely, 2^866222809088 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 866222809088

866222809088 is an abundant number, since it is smaller than the sum of its proper divisors (1335366884371).

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

866222809088 is an equidigital number, since it uses as much as digits as its factorization.

866222809088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292 (or 135 counting only the distinct ones).

The product of its (nonzero) digits is 10616832, while the sum is 59.

The spelling of 866222809088 in words is "eight hundred sixty-six billion, two hundred twenty-two million, eight hundred nine thousand, eighty-eight".