66104251 has 2 divisors, whose sum is σ = 66104252. Its totient is φ = 66104250.

The previous prime is 66104221. The next prime is 66104257. The reversal of 66104251 is 15240166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66104251 - 2⁵ = 66104219 is a prime.

It is not a weakly prime, because it can be changed into another prime (66104257) 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, 33052125 + 33052126.

It is an arithmetic number, because the mean of its divisors is an integer number (33052126).

Almost surely, 2^66104251 is an apocalyptic number.

66104251 is a deficient number, since it is larger than the sum of its proper divisors (1).

66104251 is an equidigital number, since it uses as much as digits as its factorization.

66104251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 66104251 is about 8130.4520784517. The cubic root of 66104251 is about 404.3366695790.

The spelling of 66104251 in words is "sixty-six million, one hundred four thousand, two hundred fifty-one".