8216621616 has 80 divisors (see below), whose sum is σ = 24449736704. Its totient is φ = 2329108992.

The previous prime is 8216621597. The next prime is 8216621671. The reversal of 8216621616 is 6161266128.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53605 + ... + 138948.

Almost surely, 2^8216621616 is an apocalyptic number.

It is an amenable number.

8216621616 is an abundant number, since it is smaller than the sum of its proper divisors (16233115088).

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

8216621616 is a wasteful number, since it uses less digits than its factorization.

8216621616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192698 (or 192692 counting only the distinct ones).

The product of its digits is 41472, while the sum is 39.

The square root of 8216621616 is about 90645.5824406242. The cubic root of 8216621616 is about 2017.8912752224.

The spelling of 8216621616 in words is "eight billion, two hundred sixteen million, six hundred twenty-one thousand, six hundred sixteen".