66500657 has 2 divisors, whose sum is σ = 66500658. Its totient is φ = 66500656.

The previous prime is 66500653. The next prime is 66500663. The reversal of 66500657 is 75600566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65788321 + 712336 = 8111^2 + 844^2 .

It is a cyclic number.

It is not a de Polignac number, because 66500657 - 2² = 66500653 is a prime.

It is not a weakly prime, because it can be changed into another prime (66500653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33250328 + 33250329.

It is an arithmetic number, because the mean of its divisors is an integer number (33250329).

Almost surely, 2^66500657 is an apocalyptic number.

It is an amenable number.

66500657 is a deficient number, since it is larger than the sum of its proper divisors (1).

66500657 is an equidigital number, since it uses as much as digits as its factorization.

66500657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 37800, while the sum is 35.

The square root of 66500657 is about 8154.7934983052. The cubic root of 66500657 is about 405.1432851747.

Subtracting 66500657 from its reverse (75600566), we obtain a palindrome (9099909).

The spelling of 66500657 in words is "sixty-six million, five hundred thousand, six hundred fifty-seven".