66611161 has 8 divisors (see below), whose sum is σ = 67525920. Its totient is φ = 65701248.

The previous prime is 66611159. The next prime is 66611179. The reversal of 66611161 is 16111666.

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 66611161 - 2¹ = 66611159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66611191) 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 7 ways as a sum of consecutive naturals, for example, 32670 + ... + 34648.

It is an arithmetic number, because the mean of its divisors is an integer number (8440740).

Almost surely, 2^66611161 is an apocalyptic number.

It is an amenable number.

66611161 is a deficient number, since it is larger than the sum of its proper divisors (914759).

66611161 is a wasteful number, since it uses less digits than its factorization.

66611161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2423.

The product of its digits is 1296, while the sum is 28.

The square root of 66611161 is about 8161.5660874614. The cubic root of 66611161 is about 405.3675695674.

The spelling of 66611161 in words is "sixty-six million, six hundred eleven thousand, one hundred sixty-one".