66504253 has 2 divisors, whose sum is σ = 66504254. Its totient is φ = 66504252.

The previous prime is 66504239. The next prime is 66504257. The reversal of 66504253 is 35240566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57426084 + 9078169 = 7578^2 + 3013^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66504253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66504257) 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, 33252126 + 33252127.

It is an arithmetic number, because the mean of its divisors is an integer number (33252127).

Almost surely, 2^66504253 is an apocalyptic number.

It is an amenable number.

66504253 is a deficient number, since it is larger than the sum of its proper divisors (1).

66504253 is an equidigital number, since it uses as much as digits as its factorization.

66504253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 66504253 is about 8155.0139791419. The cubic root of 66504253 is about 405.1505877040.

The spelling of 66504253 in words is "sixty-six million, five hundred four thousand, two hundred fifty-three".