564625661 has 16 divisors (see below), whose sum is σ = 601686528. Its totient is φ = 528897600.

The previous prime is 564625657. The next prime is 564625697. The reversal of 564625661 is 166526465.

564625661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 564625661 - 2² = 564625657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (564621661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 240851 + ... + 243183.

It is an arithmetic number, because the mean of its divisors is an integer number (37605408).

Almost surely, 2^564625661 is an apocalyptic number.

It is an amenable number.

564625661 is a deficient number, since it is larger than the sum of its proper divisors (37060867).

564625661 is a wasteful number, since it uses less digits than its factorization.

564625661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2612.

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

The square root of 564625661 is about 23761.8530632609. The cubic root of 564625661 is about 826.5203241173.

The spelling of 564625661 in words is "five hundred sixty-four million, six hundred twenty-five thousand, six hundred sixty-one".