564622661 has 8 divisors (see below), whose sum is σ = 574504920. Its totient is φ = 554798592.

The previous prime is 564622631. The next prime is 564622679. The reversal of 564622661 is 166226465.

564622661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 93993025 + 470629636 = 9695^2 + 21694^2 .

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 564622661 - 2²² = 560428357 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 (564622631) 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, 5261 + ... + 34013.

It is an arithmetic number, because the mean of its divisors is an integer number (71813115).

Almost surely, 2^564622661 is an apocalyptic number.

It is an amenable number.

564622661 is a deficient number, since it is larger than the sum of its proper divisors (9882259).

564622661 is a wasteful number, since it uses less digits than its factorization.

564622661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29095.

The product of its digits is 103680, while the sum is 38.

The square root of 564622661 is about 23761.7899367872. The cubic root of 564622661 is about 826.5188602770.

It can be divided in two parts, 5646 and 22661, that multiplied together give a triangular number (127944006 = T₁₅₉₉₆).

The spelling of 564622661 in words is "five hundred sixty-four million, six hundred twenty-two thousand, six hundred sixty-one".