866808997 has 4 divisors (see below), whose sum is σ = 871347456. Its totient is φ = 862270540.

The previous prime is 866808989. The next prime is 866809037. The reversal of 866808997 is 799808668.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 866808997 - 2³ = 866808989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866808977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2268943 + ... + 2269324.

It is an arithmetic number, because the mean of its divisors is an integer number (217836864).

Almost surely, 2^866808997 is an apocalyptic number.

It is an amenable number.

866808997 is a deficient number, since it is larger than the sum of its proper divisors (4538459).

866808997 is a wasteful number, since it uses less digits than its factorization.

866808997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4538458.

The product of its (nonzero) digits is 10450944, while the sum is 61.

The square root of 866808997 is about 29441.6201490339. The cubic root of 866808997 is about 953.4716916435.

The spelling of 866808997 in words is "eight hundred sixty-six million, eight hundred eight thousand, nine hundred ninety-seven".