66698273 has 2 divisors, whose sum is σ = 66698274. Its totient is φ = 66698272.

The previous prime is 66698243. The next prime is 66698351. The reversal of 66698273 is 37289666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50794129 + 15904144 = 7127^2 + 3988^2 .

It is a cyclic number.

It is not a de Polignac number, because 66698273 - 2⁶ = 66698209 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (66698243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33349136 + 33349137.

It is an arithmetic number, because the mean of its divisors is an integer number (33349137).

Almost surely, 2^66698273 is an apocalyptic number.

It is an amenable number.

66698273 is a deficient number, since it is larger than the sum of its proper divisors (1).

66698273 is an equidigital number, since it uses as much as digits as its factorization.

66698273 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 653184, while the sum is 47.

The square root of 66698273 is about 8166.9010646634. The cubic root of 66698273 is about 405.5442016157.

The spelling of 66698273 in words is "sixty-six million, six hundred ninety-eight thousand, two hundred seventy-three".