260563661 has 2 divisors, whose sum is σ = 260563662. Its totient is φ = 260563660.

The previous prime is 260563627. The next prime is 260563669. The reversal of 260563661 is 166365062.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 232410025 + 28153636 = 15245^2 + 5306^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-260563661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (260563669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130281830 + 130281831.

It is an arithmetic number, because the mean of its divisors is an integer number (130281831).

Almost surely, 2^260563661 is an apocalyptic number.

It is an amenable number.

260563661 is a deficient number, since it is larger than the sum of its proper divisors (1).

260563661 is an equidigital number, since it uses as much as digits as its factorization.

260563661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 260563661 is about 16141.9844195192. The cubic root of 260563661 is about 638.7113237484.

It can be divided in two parts, 2605 and 63661, that added together give a palindrome (66266).

The spelling of 260563661 in words is "two hundred sixty million, five hundred sixty-three thousand, six hundred sixty-one".