566542661 has 4 divisors (see below), whose sum is σ = 566600652. Its totient is φ = 566484672.

The previous prime is 566542621. The next prime is 566542699. The reversal of 566542661 is 166245665.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 166245665 = 5 ⋅33249133.

It can be written as a sum of positive squares in 2 ways, for example, as 199092100 + 367450561 = 14110^2 + 19169^2 .

It is a cyclic number.

It is not a de Polignac number, because 566542661 - 2⁶ = 566542597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (566542621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10340 + ... + 35213.

It is an arithmetic number, because the mean of its divisors is an integer number (141650163).

Almost surely, 2^566542661 is an apocalyptic number.

It is an amenable number.

566542661 is a deficient number, since it is larger than the sum of its proper divisors (57991).

566542661 is a wasteful number, since it uses less digits than its factorization.

566542661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57990.

The product of its digits is 259200, while the sum is 41.

The square root of 566542661 is about 23802.1566459848. The cubic root of 566542661 is about 827.4546597891.

The spelling of 566542661 in words is "five hundred sixty-six million, five hundred forty-two thousand, six hundred sixty-one".