8221606818 has 16 divisors (see below), whose sum is σ = 17158136256. Its totient is φ = 2621381840.

The previous prime is 8221606817. The next prime is 8221606849. The reversal of 8221606818 is 8186061228.

It is a self number, because there is not a number n which added to its sum of digits gives 8221606818.

It is not an unprimeable number, because it can be changed into a prime (8221606817) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29788293 + ... + 29788568.

It is an arithmetic number, because the mean of its divisors is an integer number (1072383516).

Almost surely, 2^8221606818 is an apocalyptic number.

8221606818 is an abundant number, since it is smaller than the sum of its proper divisors (8936529438).

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

8221606818 is a wasteful number, since it uses less digits than its factorization.

8221606818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59576889.

The product of its (nonzero) digits is 73728, while the sum is 42.

The square root of 8221606818 is about 90673.0765883677. The cubic root of 8221606818 is about 2018.2992921390.

The spelling of 8221606818 in words is "eight billion, two hundred twenty-one million, six hundred six thousand, eight hundred eighteen".