866995803 has 24 divisors (see below), whose sum is σ = 1330539600. Its totient is φ = 542977344.

The previous prime is 866995781. The next prime is 866995819. The reversal of 866995803 is 308599668.

It is not a de Polignac number, because 866995803 - 2⁶ = 866995739 is a prime.

It is a super-2 number, since 2×866995803² = 1503363444839229618, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 866995803.

It is not an unprimeable number, because it can be changed into a prime (866995303) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35233 + ... + 54546.

It is an arithmetic number, because the mean of its divisors is an integer number (55439150).

Almost surely, 2^866995803 is an apocalyptic number.

866995803 is a deficient number, since it is larger than the sum of its proper divisors (463543797).

866995803 is a wasteful number, since it uses less digits than its factorization.

866995803 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89851 (or 89848 counting only the distinct ones).

The product of its (nonzero) digits is 2799360, while the sum is 54.

The square root of 866995803 is about 29444.7924597882. The cubic root of 866995803 is about 953.5401809492.

The spelling of 866995803 in words is "eight hundred sixty-six million, nine hundred ninety-five thousand, eight hundred three".