866012985 has 32 divisors (see below), whose sum is σ = 1547441280. Its totient is φ = 459514944.

The previous prime is 866012981. The next prime is 866013007. The reversal of 866012985 is 589210668.

It is not a de Polignac number, because 866012985 - 2² = 866012981 is a prime.

It is a super-3 number, since 3×866012985³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 866012985.

It is not an unprimeable number, because it can be changed into a prime (866012981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10314 + ... + 42876.

It is an arithmetic number, because the mean of its divisors is an integer number (48357540).

Almost surely, 2^866012985 is an apocalyptic number.

It is an amenable number.

866012985 is a deficient number, since it is larger than the sum of its proper divisors (681428295).

866012985 is a wasteful number, since it uses less digits than its factorization.

866012985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32774 (or 32768 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The square root of 866012985 is about 29428.0985624284. The cubic root of 866012985 is about 953.1797367615.

The spelling of 866012985 in words is "eight hundred sixty-six million, twelve thousand, nine hundred eighty-five".