8422712666 has 4 divisors (see below), whose sum is σ = 12634069002. Its totient is φ = 4211356332.

The previous prime is 8422712663. The next prime is 8422712681. The reversal of 8422712666 is 6662172248.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 6483631441 + 1939081225 = 80521^2 + 44035^2 .

It is not an unprimeable number, because it can be changed into a prime (8422712663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2105678165 + ... + 2105678168.

Almost surely, 2^8422712666 is an apocalyptic number.

8422712666 is a deficient number, since it is larger than the sum of its proper divisors (4211356336).

8422712666 is a wasteful number, since it uses less digits than its factorization.

8422712666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4211356335.

The product of its digits is 387072, while the sum is 44.

The square root of 8422712666 is about 91775.3380053705. The cubic root of 8422712666 is about 2034.6232132873.

The spelling of 8422712666 in words is "eight billion, four hundred twenty-two million, seven hundred twelve thousand, six hundred sixty-six".