66994273 has 2 divisors, whose sum is σ = 66994274. Its totient is φ = 66994272.

The previous prime is 66994267. The next prime is 66994303. The reversal of 66994273 is 37249966.

66994273 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34012224 + 32982049 = 5832^2 + 5743^2 .

It is a cyclic number.

It is not a de Polignac number, because 66994273 - 2⁵ = 66994241 is a prime.

It is a super-2 number, since 2×66994273² = 8976465229597058, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66994373) 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 as a sum of consecutive naturals, namely, 33497136 + 33497137.

It is an arithmetic number, because the mean of its divisors is an integer number (33497137).

Almost surely, 2^66994273 is an apocalyptic number.

It is an amenable number.

66994273 is a deficient number, since it is larger than the sum of its proper divisors (1).

66994273 is an equidigital number, since it uses as much as digits as its factorization.

66994273 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 46.

The square root of 66994273 is about 8185.0029321925. The cubic root of 66994273 is about 406.1432373337.

The spelling of 66994273 in words is "sixty-six million, nine hundred ninety-four thousand, two hundred seventy-three".