66994183 has 4 divisors (see below), whose sum is σ = 67042368. Its totient is φ = 66946000.

The previous prime is 66994177. The next prime is 66994199. The reversal of 66994183 is 38149966.

66994183 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 38149966 = 2 ⋅19074983.

It is a cyclic number.

It is not a de Polignac number, because 66994183 - 2⁹ = 66993671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66994163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21943 + ... + 24808.

It is an arithmetic number, because the mean of its divisors is an integer number (16760592).

Almost surely, 2^66994183 is an apocalyptic number.

66994183 is a deficient number, since it is larger than the sum of its proper divisors (48185).

66994183 is a wasteful number, since it uses less digits than its factorization.

66994183 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48184.

The product of its digits is 279936, while the sum is 46.

The square root of 66994183 is about 8184.9974343307. The cubic root of 66994183 is about 406.1430554629.

The spelling of 66994183 in words is "sixty-six million, nine hundred ninety-four thousand, one hundred eighty-three".