261055266 has 16 divisors (see below), whose sum is σ = 523793088. Its totient is φ = 86738000.

The previous prime is 261055261. The next prime is 261055271. The reversal of 261055266 is 662550162.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (261055261) and next prime (261055271).

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (261055261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68085 + ... + 71816.

It is an arithmetic number, because the mean of its divisors is an integer number (32737068).

Almost surely, 2^261055266 is an apocalyptic number.

261055266 is an abundant number, since it is smaller than the sum of its proper divisors (262737822).

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

261055266 is a wasteful number, since it uses less digits than its factorization.

261055266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140217.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 261055266 is about 16157.2047706279. The cubic root of 261055266 is about 639.1127565696.

The spelling of 261055266 in words is "two hundred sixty-one million, fifty-five thousand, two hundred sixty-six".