260115661 has 8 divisors (see below), whose sum is σ = 287696024. Its totient is φ = 233616960.

The previous prime is 260115649. The next prime is 260115677. The reversal of 260115661 is 166511062.

It can be written as a sum of positive squares in 4 ways, for example, as 122522761 + 137592900 = 11069^2 + 11730^2 .

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 260115661 - 2⁵ = 260115629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (260115161) 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, 269910 + ... + 270871.

It is an arithmetic number, because the mean of its divisors is an integer number (35962003).

Almost surely, 2^260115661 is an apocalyptic number.

It is an amenable number.

260115661 is a deficient number, since it is larger than the sum of its proper divisors (27580363).

260115661 is a wasteful number, since it uses less digits than its factorization.

260115661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540831.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 260115661 is about 16128.1015931820. The cubic root of 260115661 is about 638.3450577569.

It can be divided in two parts, 260 and 115661, that added together give a triangular number (115921 = T₄₈₁).

The spelling of 260115661 in words is "two hundred sixty million, one hundred fifteen thousand, six hundred sixty-one".