8201820618 has 64 divisors (see below), whose sum is σ = 18331971840. Its totient is φ = 2718144000.

The previous prime is 8201820607. The next prime is 8201820647. The reversal of 8201820618 is 8160281028.

8201820618 is a `hidden beast` number, since 8 + 2 + 0 + 18 + 20 + 618 = 666.

It is a super-2 number, since 2×8201820618² (a number of 21 digits) contains 22 as substring.

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, 11281371 + ... + 11282097.

It is an arithmetic number, because the mean of its divisors is an integer number (286437060).

Almost surely, 2^8201820618 is an apocalyptic number.

8201820618 is an abundant number, since it is smaller than the sum of its proper divisors (10130151222).

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

8201820618 is a wasteful number, since it uses less digits than its factorization.

8201820618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1660 (or 1654 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The square root of 8201820618 is about 90563.9035046524. The cubic root of 8201820618 is about 2016.6789052403.

The spelling of 8201820618 in words is "eight billion, two hundred one million, eight hundred twenty thousand, six hundred eighteen".