8220660681 has 4 divisors (see below), whose sum is σ = 10960880912. Its totient is φ = 5480440452.

The previous prime is 8220660673. The next prime is 8220660689. The reversal of 8220660681 is 1860660228.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (8220660673) and next prime (8220660689).

It is not a de Polignac number, because 8220660681 - 2³ = 8220660673 is a prime.

It is a super-2 number, since 2×8220660681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8220660689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1370110111 + ... + 1370110116.

It is an arithmetic number, because the mean of its divisors is an integer number (2740220228).

Almost surely, 2^8220660681 is an apocalyptic number.

It is an amenable number.

8220660681 is a deficient number, since it is larger than the sum of its proper divisors (2740220231).

8220660681 is a wasteful number, since it uses less digits than its factorization.

8220660681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2740220230.

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 8220660681 is about 90667.8591398297. The cubic root of 8220660681 is about 2018.2218676591.

The spelling of 8220660681 in words is "eight billion, two hundred twenty million, six hundred sixty thousand, six hundred eighty-one".