2185018505 has 4 divisors (see below), whose sum is σ = 2622022212. Its totient is φ = 1748014800.

The previous prime is 2185018501. The next prime is 2185018519. The reversal of 2185018505 is 5058105812.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1417673104 + 767345401 = 37652^2 + 27701^2 .

It is not a de Polignac number, because 2185018505 - 2² = 2185018501 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2185018501) 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, 218501846 + ... + 218501855.

It is an arithmetic number, because the mean of its divisors is an integer number (655505553).

Almost surely, 2^2185018505 is an apocalyptic number.

It is an amenable number.

2185018505 is a deficient number, since it is larger than the sum of its proper divisors (437003707).

2185018505 is an equidigital number, since it uses as much as digits as its factorization.

2185018505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437003706.

The product of its (nonzero) digits is 16000, while the sum is 35.

The square root of 2185018505 is about 46744.1815095740. The cubic root of 2185018505 is about 1297.6324769478.

The spelling of 2185018505 in words is "two billion, one hundred eighty-five million, eighteen thousand, five hundred five".