8320216681 has 8 divisors (see below), whose sum is σ = 9539794880. Its totient is φ = 7108382448.

The previous prime is 8320216649. The next prime is 8320216711. The reversal of 8320216681 is 1866120238.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8320216681 - 2⁵ = 8320216649 is a prime.

It is a super-2 number, since 2×8320216681² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8320216681.

It is not an unprimeable number, because it can be changed into a prime (8320216621) 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, 1933686 + ... + 1937983.

It is an arithmetic number, because the mean of its divisors is an integer number (1192474360).

Almost surely, 2^8320216681 is an apocalyptic number.

It is an amenable number.

8320216681 is a deficient number, since it is larger than the sum of its proper divisors (1219578199).

8320216681 is a wasteful number, since it uses less digits than its factorization.

8320216681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3871983.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 8320216681 is about 91215.2217615021. The cubic root of 8320216681 is about 2026.3363982243.

The spelling of 8320216681 in words is "eight billion, three hundred twenty million, two hundred sixteen thousand, six hundred eighty-one".