866718617331 has 16 divisors (see below), whose sum is σ = 1321333914368. Its totient is φ = 495035344800.

The previous prime is 866718617293. The next prime is 866718617339. The reversal of 866718617331 is 133716817668.

It is not a de Polignac number, because 866718617331 - 2¹⁰ = 866718616307 is a prime.

It is a super-2 number, since 2×866718617331² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (866718617339) 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, 9639040 + ... + 9728541.

It is an arithmetic number, because the mean of its divisors is an integer number (82583369648).

Almost surely, 2^866718617331 is an apocalyptic number.

866718617331 is a deficient number, since it is larger than the sum of its proper divisors (454615297037).

866718617331 is a wasteful number, since it uses less digits than its factorization.

866718617331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19369722.

The product of its digits is 6096384, while the sum is 57.

The spelling of 866718617331 in words is "eight hundred sixty-six billion, seven hundred eighteen million, six hundred seventeen thousand, three hundred thirty-one".