260661601 has 8 divisors (see below), whose sum is σ = 267672104. Its totient is φ = 253739520.

The previous prime is 260661581. The next prime is 260661617. The reversal of 260661601 is 106166062.

It can be written as a sum of positive squares in 4 ways, for example, as 8614225 + 252047376 = 2935^2 + 15876^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 260661601 - 2²⁵ = 227107169 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 260661601.

It is not an unprimeable number, because it can be changed into a prime (260661301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16110 + ... + 27943.

It is an arithmetic number, because the mean of its divisors is an integer number (33459013).

Almost surely, 2^260661601 is an apocalyptic number.

It is an amenable number.

260661601 is a deficient number, since it is larger than the sum of its proper divisors (7010503).

260661601 is an equidigital number, since it uses as much as digits as its factorization.

260661601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44211.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 260661601 is about 16145.0178383302. The cubic root of 260661601 is about 638.7913394481.

The spelling of 260661601 in words is "two hundred sixty million, six hundred sixty-one thousand, six hundred one".