565605661 has 8 divisors (see below), whose sum is σ = 608042880. Its totient is φ = 524435328.

The previous prime is 565605653. The next prime is 565605671. The reversal of 565605661 is 166506565.

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

It is a cyclic number.

It is not a de Polignac number, because 565605661 - 2³ = 565605653 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 (565605631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 315796 + ... + 317581.

It is an arithmetic number, because the mean of its divisors is an integer number (76005360).

Almost surely, 2^565605661 is an apocalyptic number.

It is an amenable number.

565605661 is a deficient number, since it is larger than the sum of its proper divisors (42437219).

565605661 is a wasteful number, since it uses less digits than its factorization.

565605661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633443.

The product of its (nonzero) digits is 162000, while the sum is 40.

The square root of 565605661 is about 23782.4654104658. The cubic root of 565605661 is about 826.9982347058.

The spelling of 565605661 in words is "five hundred sixty-five million, six hundred five thousand, six hundred sixty-one".