8681664661868 has 24 divisors (see below), whose sum is σ = 16595528397840. Its totient is φ = 3941106134720.

The previous prime is 8681664661853. The next prime is 8681664661883.

It is a happy number.

8681664661868 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (8681664661853) and next prime (8681664661883).

It is a super-2 number, since 2×8681664661868² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 8681664661795 and 8681664661804.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127592483 + ... + 127660506.

It is an arithmetic number, because the mean of its divisors is an integer number (691480349910).

Almost surely, 2^{8681664661868} is an apocalyptic number.

It is an amenable number.

8681664661868 is a deficient number, since it is larger than the sum of its proper divisors (7913863735972).

8681664661868 is a wasteful number, since it uses less digits than its factorization.

8681664661868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255253777 (or 255253775 counting only the distinct ones).

The product of its digits is 764411904, while the sum is 74.

The spelling of 8681664661868 in words is "eight trillion, six hundred eighty-one billion, six hundred sixty-four million, six hundred sixty-one thousand, eight hundred sixty-eight".