66616163 has 4 divisors (see below), whose sum is σ = 66703560. Its totient is φ = 66528768.

The previous prime is 66616139. The next prime is 66616171. The reversal of 66616163 is 36161666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66616163 - 2¹⁰ = 66615139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66616663) 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 3 ways as a sum of consecutive naturals, for example, 42545 + ... + 44082.

It is an arithmetic number, because the mean of its divisors is an integer number (16675890).

Almost surely, 2^66616163 is an apocalyptic number.

66616163 is a deficient number, since it is larger than the sum of its proper divisors (87397).

66616163 is an equidigital number, since it uses as much as digits as its factorization.

66616163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87396.

The product of its digits is 23328, while the sum is 35.

The square root of 66616163 is about 8161.8725179949. The cubic root of 66616163 is about 405.3777160043.

The spelling of 66616163 in words is "sixty-six million, six hundred sixteen thousand, one hundred sixty-three".