65566261 has 8 divisors (see below), whose sum is σ = 68840640. Its totient is φ = 62327232.

The previous prime is 65566223. The next prime is 65566273. The reversal of 65566261 is 16266556.

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

It is a cyclic number.

It is not a de Polignac number, because 65566261 - 2⁹ = 65565749 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 65566261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65566201) 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, 4996 + ... + 12493.

It is an arithmetic number, because the mean of its divisors is an integer number (8605080).

Almost surely, 2^65566261 is an apocalyptic number.

It is an amenable number.

65566261 is a deficient number, since it is larger than the sum of its proper divisors (3274379).

65566261 is a wasteful number, since it uses less digits than its factorization.

65566261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17675.

The product of its digits is 64800, while the sum is 37.

The square root of 65566261 is about 8097.2996115989. The cubic root of 65566261 is about 403.2367812205.

The spelling of 65566261 in words is "sixty-five million, five hundred sixty-six thousand, two hundred sixty-one".