260194868649 has 75 divisors (see below), whose sum is σ = 412909562967. Its totient is φ = 163286890416.

The previous prime is 260194868627. The next prime is 260194868663. The reversal of 260194868649 is 946868491062.

The square root of 260194868649 is 510093.

It is a perfect power (a square), and thus also a powerful number.

260194868649 is a `hidden beast` number, since 2 + 60 + 19 + 486 + 86 + 4 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 76267107225 + 183927761424 = 276165^2 + 428868^2 .

It is not a de Polignac number, because 260194868649 - 2⁵ = 260194868617 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (260194868699) by changing a digit.

It is a polite number, since it can be written in 74 ways as a sum of consecutive naturals, for example, 1657292079 + ... + 1657292235.

Almost surely, 2^260194868649 is an apocalyptic number.

260194868649 is the 510093-rd square number.

260194868649 is the 255047-th centered octagonal number.

It is an amenable number.

260194868649 is a deficient number, since it is larger than the sum of its proper divisors (152714694318).

260194868649 is an frugal number, since it uses more digits than its factorization.

260194868649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402 (or 179 counting only the distinct ones).

The product of its (nonzero) digits is 35831808, while the sum is 63.

The spelling of 260194868649 in words is "two hundred sixty billion, one hundred ninety-four million, eight hundred sixty-eight thousand, six hundred forty-nine".