8166691317 has 4 divisors (see below), whose sum is σ = 10888921760. Its totient is φ = 5444460876.

The previous prime is 8166691307. The next prime is 8166691331. The reversal of 8166691317 is 7131966618.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 8166691317 - 2⁴ = 8166691301 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 (8166691307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1361115217 + ... + 1361115222.

It is an arithmetic number, because the mean of its divisors is an integer number (2722230440).

Almost surely, 2^8166691317 is an apocalyptic number.

It is an amenable number.

8166691317 is a deficient number, since it is larger than the sum of its proper divisors (2722230443).

8166691317 is a wasteful number, since it uses less digits than its factorization.

8166691317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2722230442.

The product of its digits is 326592, while the sum is 48.

The square root of 8166691317 is about 90369.7477975899. The cubic root of 8166691317 is about 2013.7955654750.

The spelling of 8166691317 in words is "eight billion, one hundred sixty-six million, six hundred ninety-one thousand, three hundred seventeen".