260164561 has 6 divisors (see below), whose sum is σ = 261495762. Its totient is φ = 258835680.

The previous prime is 260164529. The next prime is 260164589. The reversal of 260164561 is 165461062.

It can be written as a sum of positive squares in only one way, i.e., 242892225 + 17272336 = 15585^2 + 4156^2 .

It is not a de Polignac number, because 260164561 - 2⁵ = 260164529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (260164591) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 249880 + ... + 250918.

It is an arithmetic number, because the mean of its divisors is an integer number (43582627).

Almost surely, 2^260164561 is an apocalyptic number.

It is an amenable number.

260164561 is a deficient number, since it is larger than the sum of its proper divisors (1331201).

260164561 is an frugal number, since it uses more digits than its factorization.

260164561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2319 (or 1280 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 260164561 is about 16129.6175094142. The cubic root of 260164561 is about 638.3850567806.

The spelling of 260164561 in words is "two hundred sixty million, one hundred sixty-four thousand, five hundred sixty-one".