66693673 has 2 divisors, whose sum is σ = 66693674. Its totient is φ = 66693672.

The previous prime is 66693643. The next prime is 66693689. The reversal of 66693673 is 37639666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52533504 + 14160169 = 7248^2 + 3763^2 .

It is a cyclic number.

It is not a de Polignac number, because 66693673 - 2²⁵ = 33139241 is a prime.

It is not a weakly prime, because it can be changed into another prime (66693623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33346836 + 33346837.

It is an arithmetic number, because the mean of its divisors is an integer number (33346837).

Almost surely, 2^66693673 is an apocalyptic number.

It is an amenable number.

66693673 is a deficient number, since it is larger than the sum of its proper divisors (1).

66693673 is an equidigital number, since it uses as much as digits as its factorization.

66693673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 734832, while the sum is 46.

The square root of 66693673 is about 8166.6194352376. The cubic root of 66693673 is about 405.5348783047.

The spelling of 66693673 in words is "sixty-six million, six hundred ninety-three thousand, six hundred seventy-three".