66745163 has 4 divisors (see below), whose sum is σ = 67839408. Its totient is φ = 65650920.

The previous prime is 66745117. The next prime is 66745187. The reversal of 66745163 is 36154766.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36154766 = 2 ⋅18077383.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66745163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66745193) 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, 547031 + ... + 547152.

It is an arithmetic number, because the mean of its divisors is an integer number (16959852).

Almost surely, 2^66745163 is an apocalyptic number.

66745163 is a deficient number, since it is larger than the sum of its proper divisors (1094245).

66745163 is a wasteful number, since it uses less digits than its factorization.

66745163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1094244.

The product of its digits is 90720, while the sum is 38.

The square root of 66745163 is about 8169.7712942285. The cubic root of 66745163 is about 405.6392141366.

The spelling of 66745163 in words is "sixty-six million, seven hundred forty-five thousand, one hundred sixty-three".