66018161 has 8 divisors (see below), whose sum is σ = 72079200. Its totient is φ = 59967040.

The previous prime is 66018149. The next prime is 66018163. The reversal of 66018161 is 16181066.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66018161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66018163) 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, 22010 + ... + 24828.

It is an arithmetic number, because the mean of its divisors is an integer number (9009900).

Almost surely, 2^66018161 is an apocalyptic number.

It is an amenable number.

66018161 is a deficient number, since it is larger than the sum of its proper divisors (6061039).

66018161 is a wasteful number, since it uses less digits than its factorization.

66018161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4959.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 66018161 is about 8125.1560600397. The cubic root of 66018161 is about 404.1610658144.

The spelling of 66018161 in words is "sixty-six million, eighteen thousand, one hundred sixty-one".