665222566 has 8 divisors (see below), whose sum is σ = 1050351480. Its totient is φ = 315105408.

The previous prime is 665222489. The next prime is 665222567.

665222566 is nontrivially palindromic in base 10.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665222567) 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, 8752891 + ... + 8752966.

It is an arithmetic number, because the mean of its divisors is an integer number (131293935).

Almost surely, 2^665222566 is an apocalyptic number.

665222566 is a deficient number, since it is larger than the sum of its proper divisors (385128914).

665222566 is a wasteful number, since it uses less digits than its factorization.

665222566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17505878.

The product of its digits is 259200, while the sum is 40.

The square root of 665222566 is about 25791.9089250873. The cubic root of 665222566 is about 872.9492396746.

The spelling of 665222566 in words is "six hundred sixty-five million, two hundred twenty-two thousand, five hundred sixty-six".