8212165664 has 24 divisors (see below), whose sum is σ = 16230626748. Its totient is φ = 4090101760.

The previous prime is 8212165627. The next prime is 8212165667. The reversal of 8212165664 is 4665612128.

It can be written as a sum of positive squares in 2 ways, for example, as 8008818064 + 203347600 = 89492^2 + 14260^2 .

It is not an unprimeable number, because it can be changed into a prime (8212165667) 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 3 ways as a sum of consecutive naturals, for example, 491057 + ... + 507504.

Almost surely, 2^8212165664 is an apocalyptic number.

It is an amenable number.

8212165664 is a deficient number, since it is larger than the sum of its proper divisors (8018461084).

8212165664 is a wasteful number, since it uses less digits than its factorization.

8212165664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998828 (or 998820 counting only the distinct ones).

The product of its digits is 138240, while the sum is 41.

The square root of 8212165664 is about 90621.0001269022. Note that the first 3 decimals coincide. The cubic root of 8212165664 is about 2017.5264353897.

The spelling of 8212165664 in words is "eight billion, two hundred twelve million, one hundred sixty-five thousand, six hundred sixty-four".