8163891065 has 32 divisors (see below), whose sum is σ = 11243318400. Its totient is φ = 5635409920.

The previous prime is 8163891061. The next prime is 8163891067. The reversal of 8163891065 is 5601983618.

It is not a de Polignac number, because 8163891065 - 2² = 8163891061 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8163891061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50729 + ... + 137481.

It is an arithmetic number, because the mean of its divisors is an integer number (351353700).

Almost surely, 2^8163891065 is an apocalyptic number.

It is an amenable number.

8163891065 is a deficient number, since it is larger than the sum of its proper divisors (3079427335).

8163891065 is a wasteful number, since it uses less digits than its factorization.

8163891065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86857.

The product of its (nonzero) digits is 311040, while the sum is 47.

The square root of 8163891065 is about 90354.2531649728. The cubic root of 8163891065 is about 2013.5653710796.

The spelling of 8163891065 in words is "eight billion, one hundred sixty-three million, eight hundred ninety-one thousand, sixty-five".