567655661 has 2 divisors, whose sum is σ = 567655662. Its totient is φ = 567655660.

The previous prime is 567655607. The next prime is 567655667. The reversal of 567655661 is 166556765.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 448168900 + 119486761 = 21170^2 + 10931^2 .

It is a cyclic number.

It is not a de Polignac number, because 567655661 - 2²⁶ = 500546797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (567655667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 283827830 + 283827831.

It is an arithmetic number, because the mean of its divisors is an integer number (283827831).

Almost surely, 2^567655661 is an apocalyptic number.

It is an amenable number.

567655661 is a deficient number, since it is larger than the sum of its proper divisors (1).

567655661 is an equidigital number, since it uses as much as digits as its factorization.

567655661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1134000, while the sum is 47.

The square root of 567655661 is about 23825.5254086872. The cubic root of 567655661 is about 827.9961633505.

It can be divided in two parts, 56765 and 5661, that added together give a palindrome (62426).

The spelling of 567655661 in words is "five hundred sixty-seven million, six hundred fifty-five thousand, six hundred sixty-one".