66333251 has 2 divisors, whose sum is σ = 66333252. Its totient is φ = 66333250.

The previous prime is 66333247. The next prime is 66333257. The reversal of 66333251 is 15233366.

It is a happy number.

66333251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66333251 - 2² = 66333247 is a prime.

It is not a weakly prime, because it can be changed into another prime (66333257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33166625 + 33166626.

It is an arithmetic number, because the mean of its divisors is an integer number (33166626).

Almost surely, 2^66333251 is an apocalyptic number.

66333251 is a deficient number, since it is larger than the sum of its proper divisors (1).

66333251 is an equidigital number, since it uses as much as digits as its factorization.

66333251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 29.

The square root of 66333251 is about 8144.5227607270. The cubic root of 66333251 is about 404.8030358622.

The spelling of 66333251 in words is "sixty-six million, three hundred thirty-three thousand, two hundred fifty-one".