8683668821 has 4 divisors (see below), whose sum is σ = 8687605632. Its totient is φ = 8679732012.

The previous prime is 8683668769. The next prime is 8683668827. The reversal of 8683668821 is 1288663868.

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 a cyclic number.

It is not a de Polignac number, because 8683668821 - 2¹⁴ = 8683652437 is a prime.

It is a super-2 number, since 2×8683668821² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8683668827) 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, 1965095 + ... + 1969508.

It is an arithmetic number, because the mean of its divisors is an integer number (2171901408).

Almost surely, 2^8683668821 is an apocalyptic number.

It is an amenable number.

8683668821 is a deficient number, since it is larger than the sum of its proper divisors (3936811).

8683668821 is a wasteful number, since it uses less digits than its factorization.

8683668821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3936810.

The product of its digits is 5308416, while the sum is 56.

The square root of 8683668821 is about 93186.2051003259. The cubic root of 8683668821 is about 2055.4223943724.

The spelling of 8683668821 in words is "eight billion, six hundred eighty-three million, six hundred sixty-eight thousand, eight hundred twenty-one".