66699263 has 2 divisors, whose sum is σ = 66699264. Its totient is φ = 66699262.

The previous prime is 66699247. The next prime is 66699293. The reversal of 66699263 is 36299666.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66699263 - 2⁴ = 66699247 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66699223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33349631 + 33349632.

It is an arithmetic number, because the mean of its divisors is an integer number (33349632).

Almost surely, 2^66699263 is an apocalyptic number.

66699263 is a deficient number, since it is larger than the sum of its proper divisors (1).

66699263 is an equidigital number, since it uses as much as digits as its factorization.

66699263 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 629856, while the sum is 47.

The square root of 66699263 is about 8166.9616749437. The cubic root of 66699263 is about 405.5462080983.

The spelling of 66699263 in words is "sixty-six million, six hundred ninety-nine thousand, two hundred sixty-three".