66623163 has 16 divisors (see below), whose sum is σ = 90922752. Its totient is φ = 43380000.

The previous prime is 66623143. The next prime is 66623191. The reversal of 66623163 is 36132666.

It is a happy number.

It is not a de Polignac number, because 66623163 - 2⁵ = 66623131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66623113) 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, 26428 + ... + 28838.

It is an arithmetic number, because the mean of its divisors is an integer number (5682672).

Almost surely, 2^66623163 is an apocalyptic number.

66623163 is a deficient number, since it is larger than the sum of its proper divisors (24299589).

66623163 is a wasteful number, since it uses less digits than its factorization.

66623163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2626.

The product of its digits is 23328, while the sum is 33.

The square root of 66623163 is about 8162.3013298947. The cubic root of 66623163 is about 405.3919144836.

The spelling of 66623163 in words is "sixty-six million, six hundred twenty-three thousand, one hundred sixty-three".