66875251 has 2 divisors, whose sum is σ = 66875252. Its totient is φ = 66875250.

The previous prime is 66875239. The next prime is 66875287. The reversal of 66875251 is 15257866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66875251 - 2⁹ = 66874739 is a prime.

It is not a weakly prime, because it can be changed into another prime (66875051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33437625 + 33437626.

It is an arithmetic number, because the mean of its divisors is an integer number (33437626).

Almost surely, 2^66875251 is an apocalyptic number.

66875251 is a deficient number, since it is larger than the sum of its proper divisors (1).

66875251 is an equidigital number, since it uses as much as digits as its factorization.

66875251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100800, while the sum is 40.

The square root of 66875251 is about 8177.7289634715. The cubic root of 66875251 is about 405.9025767845.

The spelling of 66875251 in words is "sixty-six million, eight hundred seventy-five thousand, two hundred fifty-one".