566666665 has 4 divisors (see below), whose sum is σ = 680000004. Its totient is φ = 453333328.

The previous prime is 566666651. The next prime is 566666677.

It is a happy number.

566666665 is nontrivially palindromic in base 10.

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

It can be written as a sum of positive squares in 2 ways, for example, as 257891481 + 308775184 = 16059^2 + 17572^2 .

It is a cyclic number.

It is not a de Polignac number, because 566666665 - 2¹⁹ = 566142377 is a prime.

It is a super-2 number, since 2×566666665² = 642222218444444450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56666662 + ... + 56666671.

It is an arithmetic number, because the mean of its divisors is an integer number (170000001).

Almost surely, 2^566666665 is an apocalyptic number.

It is an amenable number.

566666665 is a deficient number, since it is larger than the sum of its proper divisors (113333339).

566666665 is a wasteful number, since it uses less digits than its factorization.

566666665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113333338.

The product of its digits is 6998400, while the sum is 52.

The square root of 566666665 is about 23804.7613934692. The cubic root of 566666665 is about 827.5150260595.

The spelling of 566666665 in words is "five hundred sixty-six million, six hundred sixty-six thousand, six hundred sixty-five".