866082804840 has 512 divisors, whose sum is σ = 3221627904000. Its totient is φ = 205158528000.

The previous prime is 866082804817. The next prime is 866082804857. The reversal of 866082804840 is 48408280668.

866082804840 is a `hidden beast` number, since 8 + 6 + 6 + 0 + 82 + 80 + 484 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 596886115 + ... + 596887565.

It is an arithmetic number, because the mean of its divisors is an integer number (6292242000).

Almost surely, 2^866082804840 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 866082804840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1610813952000).

866082804840 is an abundant number, since it is smaller than the sum of its proper divisors (2355545099160).

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

866082804840 is a wasteful number, since it uses less digits than its factorization.

866082804840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2598 (or 2588 counting only the distinct ones).

The product of its (nonzero) digits is 4718592, while the sum is 54.

The spelling of 866082804840 in words is "eight hundred sixty-six billion, eighty-two million, eight hundred four thousand, eight hundred forty".