260436661 has 2 divisors, whose sum is σ = 260436662. Its totient is φ = 260436660.

The previous prime is 260436641. The next prime is 260436697. The reversal of 260436661 is 166634062.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 220671025 + 39765636 = 14855^2 + 6306^2 .

It is a cyclic number.

It is not a de Polignac number, because 260436661 - 2²¹ = 258339509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (260436641) 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, 130218330 + 130218331.

It is an arithmetic number, because the mean of its divisors is an integer number (130218331).

Almost surely, 2^260436661 is an apocalyptic number.

It is an amenable number.

260436661 is a deficient number, since it is larger than the sum of its proper divisors (1).

260436661 is an equidigital number, since it uses as much as digits as its factorization.

260436661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 260436661 is about 16138.0500990671. The cubic root of 260436661 is about 638.6075365457.

It can be divided in two parts, 260 and 436661, that added together give a square (436921 = 661²).

The spelling of 260436661 in words is "two hundred sixty million, four hundred thirty-six thousand, six hundred sixty-one".