66712273 has 2 divisors, whose sum is σ = 66712274. Its totient is φ = 66712272.

The previous prime is 66712237. The next prime is 66712337. The reversal of 66712273 is 37221766.

It is a happy number.

Together with previous prime (66712237) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61591104 + 5121169 = 7848^2 + 2263^2 .

It is a cyclic number.

It is not a de Polignac number, because 66712273 - 2¹⁷ = 66581201 is a prime.

It is not a weakly prime, because it can be changed into another prime (66712873) 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 as a sum of consecutive naturals, namely, 33356136 + 33356137.

It is an arithmetic number, because the mean of its divisors is an integer number (33356137).

Almost surely, 2^66712273 is an apocalyptic number.

It is an amenable number.

66712273 is a deficient number, since it is larger than the sum of its proper divisors (1).

66712273 is an equidigital number, since it uses as much as digits as its factorization.

66712273 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 34.

The square root of 66712273 is about 8167.7581379470. The cubic root of 66712273 is about 405.5725742724.

The spelling of 66712273 in words is "sixty-six million, seven hundred twelve thousand, two hundred seventy-three".