866585980836 has 63 divisors (see below), whose sum is σ = 2273879962011. Its totient is φ = 288845237304.

The previous prime is 866585980831. The next prime is 866585980891. The reversal of 866585980836 is 638089585668.

The square root of 866585980836 is 930906.

It is a perfect power (a square), and thus also a powerful number.

866585980836 is a `hidden beast` number, since 8 + 6 + 6 + 585 + 9 + 8 + 0 + 8 + 36 = 666.

It is not an unprimeable number, because it can be changed into a prime (866585980831) by changing a digit.

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 20 ways as a sum of consecutive naturals, for example, 50260305 + ... + 50277543.

Almost surely, 2^866585980836 is an apocalyptic number.

866585980836 is the 930906-th square number.

It is an amenable number.

866585980836 is an abundant number, since it is smaller than the sum of its proper divisors (1407293981175).

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

866585980836 is an frugal number, since it uses more digits than its factorization.

866585980836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34500 (or 17244 counting only the distinct ones).

The product of its (nonzero) digits is 597196800, while the sum is 72.

The spelling of 866585980836 in words is "eight hundred sixty-six billion, five hundred eighty-five million, nine hundred eighty thousand, eight hundred thirty-six".