66668473 has 4 divisors (see below), whose sum is σ = 70177360. Its totient is φ = 63159588.

The previous prime is 66668449. The next prime is 66668479. The reversal of 66668473 is 37486666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66668473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66668479) 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, 1754415 + ... + 1754452.

It is an arithmetic number, because the mean of its divisors is an integer number (17544340).

Almost surely, 2^66668473 is an apocalyptic number.

It is an amenable number.

66668473 is a deficient number, since it is larger than the sum of its proper divisors (3508887).

66668473 is a wasteful number, since it uses less digits than its factorization.

66668473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3508886.

The product of its digits is 870912, while the sum is 46.

The square root of 66668473 is about 8165.0764234023. The cubic root of 66668473 is about 405.4837951666.

The spelling of 66668473 in words is "sixty-six million, six hundred sixty-eight thousand, four hundred seventy-three".