66954673 has 4 divisors (see below), whose sum is σ = 67056628. Its totient is φ = 66852720.

The previous prime is 66954661. The next prime is 66954683. The reversal of 66954673 is 37645966.

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

It can be written as a sum of positive squares in 2 ways, for example, as 61968384 + 4986289 = 7872^2 + 2233^2 .

It is a cyclic number.

It is not a de Polignac number, because 66954673 - 2⁹ = 66954161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66954683) 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, 49986 + ... + 51307.

It is an arithmetic number, because the mean of its divisors is an integer number (16764157).

Almost surely, 2^66954673 is an apocalyptic number.

It is an amenable number.

66954673 is a deficient number, since it is larger than the sum of its proper divisors (101955).

66954673 is a wasteful number, since it uses less digits than its factorization.

66954673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101954.

The product of its digits is 816480, while the sum is 46.

The square root of 66954673 is about 8182.5835162252. The cubic root of 66954673 is about 406.0631984417.

The spelling of 66954673 in words is "sixty-six million, nine hundred fifty-four thousand, six hundred seventy-three".