565501663 has 4 divisors (see below), whose sum is σ = 569954560. Its totient is φ = 561048768.

The previous prime is 565501649. The next prime is 565501681. The reversal of 565501663 is 366105565.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 565501663 - 2⁵ = 565501631 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 (565501763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2226258 + ... + 2226511.

It is an arithmetic number, because the mean of its divisors is an integer number (142488640).

Almost surely, 2^565501663 is an apocalyptic number.

565501663 is a deficient number, since it is larger than the sum of its proper divisors (4452897).

565501663 is a wasteful number, since it uses less digits than its factorization.

565501663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4452896.

The product of its (nonzero) digits is 81000, while the sum is 37.

The square root of 565501663 is about 23780.2788671622. The cubic root of 565501663 is about 826.9475448346.

The spelling of 565501663 in words is "five hundred sixty-five million, five hundred one thousand, six hundred sixty-three".