8161866019 has 4 divisors (see below), whose sum is σ = 8186085544. Its totient is φ = 8137646496.

The previous prime is 8161865977. The next prime is 8161866029. The reversal of 8161866019 is 9106681618.

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 8161866019 - 2¹³ = 8161857827 is a prime.

It is a super-2 number, since 2×8161866019² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8161866019.

It is not an unprimeable number, because it can be changed into a prime (8161866029) 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, 12109257 + ... + 12109930.

It is an arithmetic number, because the mean of its divisors is an integer number (2046521386).

Almost surely, 2^8161866019 is an apocalyptic number.

8161866019 is a deficient number, since it is larger than the sum of its proper divisors (24219525).

8161866019 is a wasteful number, since it uses less digits than its factorization.

8161866019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24219524.

The product of its (nonzero) digits is 124416, while the sum is 46.

The square root of 8161866019 is about 90343.0463234443. The cubic root of 8161866019 is about 2013.3988696054.

The spelling of 8161866019 in words is "eight billion, one hundred sixty-one million, eight hundred sixty-six thousand, nineteen".