6845918185 has 4 divisors (see below), whose sum is σ = 8215101828. Its totient is φ = 5476734544.

The previous prime is 6845918143. The next prime is 6845918197. The reversal of 6845918185 is 5818195486.

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 4632027481 + 2213890704 = 68059^2 + 47052^2 .

It is a cyclic number.

It is not a de Polignac number, because 6845918185 - 2²³ = 6837529577 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 684591814 + ... + 684591823.

It is an arithmetic number, because the mean of its divisors is an integer number (2053775457).

Almost surely, 2^6845918185 is an apocalyptic number.

It is an amenable number.

6845918185 is a deficient number, since it is larger than the sum of its proper divisors (1369183643).

6845918185 is a wasteful number, since it uses less digits than its factorization.

6845918185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1369183642.

The product of its digits is 2764800, while the sum is 55.

The square root of 6845918185 is about 82740.0639654092. The cubic root of 6845918185 is about 1898.7913074257.

The spelling of 6845918185 in words is "six billion, eight hundred forty-five million, nine hundred eighteen thousand, one hundred eighty-five".