66761263 has 2 divisors, whose sum is σ = 66761264. Its totient is φ = 66761262.

The previous prime is 66761237. The next prime is 66761293. The reversal of 66761263 is 36216766.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66761263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66761293) 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, 33380631 + 33380632.

It is an arithmetic number, because the mean of its divisors is an integer number (33380632).

Almost surely, 2^66761263 is an apocalyptic number.

66761263 is a deficient number, since it is larger than the sum of its proper divisors (1).

66761263 is an equidigital number, since it uses as much as digits as its factorization.

66761263 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 37.

The square root of 66761263 is about 8170.7565745162. The cubic root of 66761263 is about 405.6718270682.

The spelling of 66761263 in words is "sixty-six million, seven hundred sixty-one thousand, two hundred sixty-three".