8181252845 has 16 divisors (see below), whose sum is σ = 10356882240. Its totient is φ = 6186927744.

The previous prime is 8181252841. The next prime is 8181252847. The reversal of 8181252845 is 5482521818.

It is not a de Polignac number, because 8181252845 - 2² = 8181252841 is a prime.

It is a super-2 number, since 2×8181252845² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 8181252796 and 8181252805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8181252841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50807 + ... + 137636.

It is an arithmetic number, because the mean of its divisors is an integer number (647305140).

Almost surely, 2^8181252845 is an apocalyptic number.

It is an amenable number.

8181252845 is a deficient number, since it is larger than the sum of its proper divisors (2175629395).

8181252845 is a wasteful number, since it uses less digits than its factorization.

8181252845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188924.

The product of its digits is 204800, while the sum is 44.

The square root of 8181252845 is about 90450.2783025016. The cubic root of 8181252845 is about 2014.9917467290.

The spelling of 8181252845 in words is "eight billion, one hundred eighty-one million, two hundred fifty-two thousand, eight hundred forty-five".