261261366 has 32 divisors (see below), whose sum is σ = 553970688. Its totient is φ = 81997920.

The previous prime is 261261359. The next prime is 261261383. The reversal of 261261366 is 663162162.

261261366 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 12100 + ... + 25863.

It is an arithmetic number, because the mean of its divisors is an integer number (17311584).

Almost surely, 2^261261366 is an apocalyptic number.

261261366 is an abundant number, since it is smaller than the sum of its proper divisors (292709322).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261261366 is a wasteful number, since it uses less digits than its factorization.

261261366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38036.

The product of its digits is 15552, while the sum is 33.

The square root of 261261366 is about 16163.5814719387. The cubic root of 261261366 is about 639.2809029449.

The spelling of 261261366 in words is "two hundred sixty-one million, two hundred sixty-one thousand, three hundred sixty-six".