66873253 has 2 divisors, whose sum is σ = 66873254. Its totient is φ = 66873252.

The previous prime is 66873241. The next prime is 66873277. The reversal of 66873253 is 35237866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61199329 + 5673924 = 7823^2 + 2382^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66873253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66873283) 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, 33436626 + 33436627.

It is an arithmetic number, because the mean of its divisors is an integer number (33436627).

Almost surely, 2^66873253 is an apocalyptic number.

It is an amenable number.

66873253 is a deficient number, since it is larger than the sum of its proper divisors (1).

66873253 is an equidigital number, since it uses as much as digits as its factorization.

66873253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 40.

The square root of 66873253 is about 8177.6068015037. The cubic root of 66873253 is about 405.8985344250.

The spelling of 66873253 in words is "sixty-six million, eight hundred seventy-three thousand, two hundred fifty-three".