866494279 has 4 divisors (see below), whose sum is σ = 990279184. Its totient is φ = 742709376.

The previous prime is 866494271. The next prime is 866494327. The reversal of 866494279 is 972494668.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 866494279 - 2³ = 866494271 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 (866494271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61892442 + ... + 61892455.

It is an arithmetic number, because the mean of its divisors is an integer number (247569796).

Almost surely, 2^866494279 is an apocalyptic number.

866494279 is a deficient number, since it is larger than the sum of its proper divisors (123784905).

866494279 is a wasteful number, since it uses less digits than its factorization.

866494279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123784904.

The product of its digits is 5225472, while the sum is 55.

The square root of 866494279 is about 29436.2748832117. The cubic root of 866494279 is about 953.3562832783.

The spelling of 866494279 in words is "eight hundred sixty-six million, four hundred ninety-four thousand, two hundred seventy-nine".