8161585919 has 4 divisors (see below), whose sum is σ = 8170788144. Its totient is φ = 8152383696.

The previous prime is 8161585909. The next prime is 8161585933. The reversal of 8161585919 is 9195851618.

It is a happy number.

8161585919 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8161585919 is a prime.

It is a super-2 number, since 2×8161585919² (a number of 21 digits) contains 22 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 (8161585909) 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, 4599782 + ... + 4601555.

It is an arithmetic number, because the mean of its divisors is an integer number (2042697036).

Almost surely, 2^8161585919 is an apocalyptic number.

8161585919 is a deficient number, since it is larger than the sum of its proper divisors (9202225).

8161585919 is an equidigital number, since it uses as much as digits as its factorization.

8161585919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9202224.

The product of its digits is 777600, while the sum is 53.

The square root of 8161585919 is about 90341.4961078241. The cubic root of 8161585919 is about 2013.3758373121.

The spelling of 8161585919 in words is "eight billion, one hundred sixty-one million, five hundred eighty-five thousand, nine hundred nineteen".