561116666 has 8 divisors (see below), whose sum is σ = 918190944. Its totient is φ = 255053020.

The previous prime is 561116663. The next prime is 561116669. The reversal of 561116666 is 666611165.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (561116663) and next prime (561116669).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (561116663) 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, 12752630 + ... + 12752673.

It is an arithmetic number, because the mean of its divisors is an integer number (114773868).

Almost surely, 2^561116666 is an apocalyptic number.

561116666 is a deficient number, since it is larger than the sum of its proper divisors (357074278).

561116666 is a wasteful number, since it uses less digits than its factorization.

561116666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25505316.

The product of its digits is 38880, while the sum is 38.

The square root of 561116666 is about 23687.9012578151. The cubic root of 561116666 is about 824.8045651548.

The spelling of 561116666 in words is "five hundred sixty-one million, one hundred sixteen thousand, six hundred sixty-six".