66666073 has 8 divisors (see below), whose sum is σ = 67737600. Its totient is φ = 65601888.

The previous prime is 66666071. The next prime is 66666097. The reversal of 66666073 is 37066666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66666073 - 2¹ = 66666071 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66666071) 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 7 ways as a sum of consecutive naturals, for example, 18168 + ... + 21526.

It is an arithmetic number, because the mean of its divisors is an integer number (8467200).

Almost surely, 2^66666073 is an apocalyptic number.

It is an amenable number.

66666073 is a deficient number, since it is larger than the sum of its proper divisors (1071527).

66666073 is a wasteful number, since it uses less digits than its factorization.

66666073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3671.

The product of its (nonzero) digits is 163296, while the sum is 40.

The square root of 66666073 is about 8164.9294546861. The cubic root of 66666073 is about 405.4789294345.

The spelling of 66666073 in words is "sixty-six million, six hundred sixty-six thousand, seventy-three".