8161108666 has 4 divisors (see below), whose sum is σ = 12241663002. Its totient is φ = 4080554332.

The previous prime is 8161108663. The next prime is 8161108691. The reversal of 8161108666 is 6668011618.

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., 4269969025 + 3891139641 = 65345^2 + 62379^2 .

It is not an unprimeable number, because it can be changed into a prime (8161108663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2040277165 + ... + 2040277168.

Almost surely, 2^8161108666 is an apocalyptic number.

8161108666 is a deficient number, since it is larger than the sum of its proper divisors (4080554336).

8161108666 is a wasteful number, since it uses less digits than its factorization.

8161108666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4080554335.

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 8161108666 is about 90338.8546861205. The cubic root of 8161108666 is about 2013.3365921459.

The spelling of 8161108666 in words is "eight billion, one hundred sixty-one million, one hundred eight thousand, six hundred sixty-six".