564552555661 has 2 divisors, whose sum is σ = 564552555662. Its totient is φ = 564552555660.

The previous prime is 564552555631. The next prime is 564552555709. The reversal of 564552555661 is 166555255465.

564552555661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 391813402500 + 172739153161 = 625950^2 + 415619^2 .

It is a cyclic number.

It is not a de Polignac number, because 564552555661 - 2⁵ = 564552555629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (564552555631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 282276277830 + 282276277831.

It is an arithmetic number, because the mean of its divisors is an integer number (282276277831).

Almost surely, 2^564552555661 is an apocalyptic number.

It is an amenable number.

564552555661 is a deficient number, since it is larger than the sum of its proper divisors (1).

564552555661 is an equidigital number, since it uses as much as digits as its factorization.

564552555661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27000000, while the sum is 55.

The spelling of 564552555661 in words is "five hundred sixty-four billion, five hundred fifty-two million, five hundred fifty-five thousand, six hundred sixty-one".