8168159991 has 8 divisors (see below), whose sum is σ = 10891544560. Its totient is φ = 5445107712.

The previous prime is 8168159963. The next prime is 8168160001. The reversal of 8168159991 is 1999518618.

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

It is not a de Polignac number, because 8168159991 - 2⁶ = 8168159927 is a prime.

It is a super-3 number, since 3×8168159991³ (a number of 31 digits) contains 333 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 (8168154991) 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, 18556 + ... + 129153.

It is an arithmetic number, because the mean of its divisors is an integer number (1361443070).

Almost surely, 2^8168159991 is an apocalyptic number.

8168159991 is a deficient number, since it is larger than the sum of its proper divisors (2723384569).

8168159991 is a wasteful number, since it uses less digits than its factorization.

8168159991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166145.

The product of its digits is 1399680, while the sum is 57.

The square root of 8168159991 is about 90377.8733485138. The cubic root of 8168159991 is about 2013.9162766172.

The spelling of 8168159991 in words is "eight billion, one hundred sixty-eight million, one hundred fifty-nine thousand, nine hundred ninety-one".