866942517 has 16 divisors (see below), whose sum is σ = 1321756160. Its totient is φ = 495132912.

The previous prime is 866942477. The next prime is 866942533. The reversal of 866942517 is 715249668.

It is not a de Polignac number, because 866942517 - 2⁷ = 866942389 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 (866942537) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33834 + ... + 53652.

It is an arithmetic number, because the mean of its divisors is an integer number (82609760).

Almost surely, 2^866942517 is an apocalyptic number.

It is an amenable number.

866942517 is a deficient number, since it is larger than the sum of its proper divisors (454813643).

866942517 is a wasteful number, since it uses less digits than its factorization.

866942517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21912.

The product of its digits is 725760, while the sum is 48.

The square root of 866942517 is about 29443.8875999757. The cubic root of 866942517 is about 953.5206455286.

The spelling of 866942517 in words is "eight hundred sixty-six million, nine hundred forty-two thousand, five hundred seventeen".