2185555813 has 8 divisors (see below), whose sum is σ = 2502996480. Its totient is φ = 1869419760.

The previous prime is 2185555787. The next prime is 2185555829. The reversal of 2185555813 is 3185555812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2185555813 is a prime.

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 2185555813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2185555213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 322558 + ... + 329263.

It is an arithmetic number, because the mean of its divisors is an integer number (312874560).

Almost surely, 2^2185555813 is an apocalyptic number.

It is an amenable number.

2185555813 is a deficient number, since it is larger than the sum of its proper divisors (317440667).

2185555813 is an equidigital number, since it uses as much as digits as its factorization.

2185555813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652307.

The product of its digits is 240000, while the sum is 43.

The square root of 2185555813 is about 46749.9284812287. The cubic root of 2185555813 is about 1297.7388332046.

Subtracting 2185555813 from its reverse (3185555812), we obtain a palindrome (999999999).

The spelling of 2185555813 in words is "two billion, one hundred eighty-five million, five hundred fifty-five thousand, eight hundred thirteen".