8166509867 has 4 divisors (see below), whose sum is σ = 8166696600. Its totient is φ = 8166323136.

The previous prime is 8166509849. The next prime is 8166509899. The reversal of 8166509867 is 7689056618.

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 8166509867 - 2⁶ = 8166509803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8166502867) 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, 11483 + ... + 128315.

It is an arithmetic number, because the mean of its divisors is an integer number (2041674150).

Almost surely, 2^8166509867 is an apocalyptic number.

8166509867 is a deficient number, since it is larger than the sum of its proper divisors (186733).

8166509867 is a wasteful number, since it uses less digits than its factorization.

8166509867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186732.

The product of its (nonzero) digits is 4354560, while the sum is 56.

The square root of 8166509867 is about 90368.7438609169. The cubic root of 8166509867 is about 2013.7806509930.

The spelling of 8166509867 in words is "eight billion, one hundred sixty-six million, five hundred nine thousand, eight hundred sixty-seven".