261065163 has 16 divisors (see below), whose sum is σ = 368877600. Its totient is φ = 163941120.

The previous prime is 261065153. The next prime is 261065173. The reversal of 261065163 is 361560162.

It is an interprime number because it is at equal distance from previous prime (261065153) and next prime (261065173).

It is not a de Polignac number, because 261065163 - 2²⁴ = 244287947 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 261065163.

It is not an unprimeable number, because it can be changed into a prime (261065113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33028 + ... + 40161.

It is an arithmetic number, because the mean of its divisors is an integer number (23054850).

Almost surely, 2^261065163 is an apocalyptic number.

261065163 is a deficient number, since it is larger than the sum of its proper divisors (107812437).

261065163 is a wasteful number, since it uses less digits than its factorization.

261065163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73262.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 261065163 is about 16157.5110397610. The cubic root of 261065163 is about 639.1208330446.

The spelling of 261065163 in words is "two hundred sixty-one million, sixty-five thousand, one hundred sixty-three".