66250277 has 2 divisors, whose sum is σ = 66250278. Its totient is φ = 66250276.

The previous prime is 66250253. The next prime is 66250279. The reversal of 66250277 is 77205266.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54967396 + 11282881 = 7414^2 + 3359^2 .

It is a cyclic number.

It is not a de Polignac number, because 66250277 - 2¹⁸ = 65988133 is a prime.

Together with 66250279, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66250279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33125138 + 33125139.

It is an arithmetic number, because the mean of its divisors is an integer number (33125139).

Almost surely, 2^66250277 is an apocalyptic number.

It is an amenable number.

66250277 is a deficient number, since it is larger than the sum of its proper divisors (1).

66250277 is an equidigital number, since it uses as much as digits as its factorization.

66250277 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35280, while the sum is 35.

The square root of 66250277 is about 8139.4273140068. The cubic root of 66250277 is about 404.6341806697.

The spelling of 66250277 in words is "sixty-six million, two hundred fifty thousand, two hundred seventy-seven".