8181305646 has 64 divisors (see below), whose sum is σ = 17752627200. Its totient is φ = 2505123936.

The previous prime is 8181305611. The next prime is 8181305659. The reversal of 8181305646 is 6465031818.

8181305646 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 8181305598 and 8181305607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 675375 + ... + 687381.

It is an arithmetic number, because the mean of its divisors is an integer number (277384800).

Almost surely, 2^8181305646 is an apocalyptic number.

8181305646 is a gapful number since it is divisible by the number (86) formed by its first and last digit.

8181305646 is an abundant number, since it is smaller than the sum of its proper divisors (9571321554).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8181305646 is a wasteful number, since it uses less digits than its factorization.

8181305646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12213.

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 8181305646 is about 90450.5701806241. The cubic root of 8181305646 is about 2014.9960815724.

The spelling of 8181305646 in words is "eight billion, one hundred eighty-one million, three hundred five thousand, six hundred forty-six".