866118679 has 4 divisors (see below), whose sum is σ = 884546784. Its totient is φ = 847690576.

The previous prime is 866118661. The next prime is 866118689. The reversal of 866118679 is 976811668.

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 866118679 - 2¹⁷ = 865987607 is a prime.

It is a super-2 number, since 2×866118679² = 1500323132225410082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866118689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9213982 + ... + 9214075.

It is an arithmetic number, because the mean of its divisors is an integer number (221136696).

Almost surely, 2^866118679 is an apocalyptic number.

866118679 is a deficient number, since it is larger than the sum of its proper divisors (18428105).

866118679 is a wasteful number, since it uses less digits than its factorization.

866118679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18428104.

The product of its digits is 870912, while the sum is 52.

The square root of 866118679 is about 29429.8943083389. The cubic root of 866118679 is about 953.2185126546.

The spelling of 866118679 in words is "eight hundred sixty-six million, one hundred eighteen thousand, six hundred seventy-nine".