8421666713 has 4 divisors (see below), whose sum is σ = 8430235008. Its totient is φ = 8413098420.

The previous prime is 8421666679. The next prime is 8421666719. The reversal of 8421666713 is 3176661248.

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 8421666713 - 2¹⁰ = 8421665689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8421666719) 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, 4282673 + ... + 4284638.

It is an arithmetic number, because the mean of its divisors is an integer number (2107558752).

Almost surely, 2^8421666713 is an apocalyptic number.

It is an amenable number.

8421666713 is a deficient number, since it is larger than the sum of its proper divisors (8568295).

8421666713 is an equidigital number, since it uses as much as digits as its factorization.

8421666713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8568294.

The product of its digits is 290304, while the sum is 44.

The square root of 8421666713 is about 91769.6393858012. The cubic root of 8421666713 is about 2034.5389883099.

The spelling of 8421666713 in words is "eight billion, four hundred twenty-one million, six hundred sixty-six thousand, seven hundred thirteen".