866163291 has 8 divisors (see below), whose sum is σ = 1319867904. Its totient is φ = 494950440.

The previous prime is 866163289. The next prime is 866163307. The reversal of 866163291 is 192361668.

866163291 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 866163291 - 2¹ = 866163289 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (866163391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20622915 + ... + 20622956.

It is an arithmetic number, because the mean of its divisors is an integer number (164983488).

Almost surely, 2^866163291 is an apocalyptic number.

866163291 is a deficient number, since it is larger than the sum of its proper divisors (453704613).

866163291 is a wasteful number, since it uses less digits than its factorization.

866163291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41245881.

The product of its digits is 93312, while the sum is 42.

The square root of 866163291 is about 29430.6522353821. The cubic root of 866163291 is about 953.2348784850.

The spelling of 866163291 in words is "eight hundred sixty-six million, one hundred sixty-three thousand, two hundred ninety-one".