5681171818 has 24 divisors (see below), whose sum is σ = 9925164900. Its totient is φ = 2431816128.

The previous prime is 5681171801. The next prime is 5681171857. The reversal of 5681171818 is 8181711865.

It can be written as a sum of positive squares in 2 ways, for example, as 5239877769 + 441294049 = 72387^2 + 21007^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46278 + ... + 116206.

Almost surely, 2^5681171818 is an apocalyptic number.

5681171818 is a deficient number, since it is larger than the sum of its proper divisors (4243993082).

5681171818 is a wasteful number, since it uses less digits than its factorization.

5681171818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70774 (or 70767 counting only the distinct ones).

The product of its digits is 107520, while the sum is 46.

The square root of 5681171818 is about 75373.5485299717. The cubic root of 5681171818 is about 1784.3469711709.

The spelling of 5681171818 in words is "five billion, six hundred eighty-one million, one hundred seventy-one thousand, eight hundred eighteen".