261120165 has 8 divisors (see below), whose sum is σ = 417792288. Its totient is φ = 139264080.

The previous prime is 261120163. The next prime is 261120169. The reversal of 261120165 is 561021162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 261120165 - 2¹ = 261120163 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261120163) 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, 8703991 + ... + 8704020.

It is an arithmetic number, because the mean of its divisors is an integer number (52224036).

Almost surely, 2^261120165 is an apocalyptic number.

It is an amenable number.

261120165 is a deficient number, since it is larger than the sum of its proper divisors (156672123).

261120165 is a wasteful number, since it uses less digits than its factorization.

261120165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17408019.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 261120165 is about 16159.2130068268. The cubic root of 261120165 is about 639.1657138645.

The spelling of 261120165 in words is "two hundred sixty-one million, one hundred twenty thousand, one hundred sixty-five".