565552661 has 4 divisors (see below), whose sum is σ = 565600800. Its totient is φ = 565504524.

The previous prime is 565552657. The next prime is 565552667. The reversal of 565552661 is 166255565.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 565552661 - 2² = 565552657 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 (565552667) 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, 6470 + ... + 34248.

It is an arithmetic number, because the mean of its divisors is an integer number (141400200).

Almost surely, 2^565552661 is an apocalyptic number.

It is an amenable number.

565552661 is a deficient number, since it is larger than the sum of its proper divisors (48139).

565552661 is a wasteful number, since it uses less digits than its factorization.

565552661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48138.

The product of its digits is 270000, while the sum is 41.

The square root of 565552661 is about 23781.3511180505. The cubic root of 565552661 is about 826.9724026473.

The spelling of 565552661 in words is "five hundred sixty-five million, five hundred fifty-two thousand, six hundred sixty-one".