18128671065 has 12 divisors (see below), whose sum is σ = 31423029924. Its totient is φ = 9668624544.

The previous prime is 18128671061. The next prime is 18128671079. The reversal of 18128671065 is 56017682181.

It can be written as a sum of positive squares in 2 ways, for example, as 12145803264 + 5982867801 = 110208^2 + 77349^2 .

It is not a de Polignac number, because 18128671065 - 2² = 18128671061 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 402859357 = 18128671065 / (1 + 8 + 1 + 2 + 8 + 6 + 7 + 1 + 0 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 18128671065.

It is not an unprimeable number, because it can be changed into a prime (18128671061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 201429634 + ... + 201429723.

It is an arithmetic number, because the mean of its divisors is an integer number (2618585827).

Almost surely, 2^18128671065 is an apocalyptic number.

18128671065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18128671065 is a deficient number, since it is larger than the sum of its proper divisors (13294358859).

18128671065 is a wasteful number, since it uses less digits than its factorization.

18128671065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402859368 (or 402859365 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 45.

The spelling of 18128671065 in words is "eighteen billion, one hundred twenty-eight million, six hundred seventy-one thousand, sixty-five".