66910693 has 2 divisors, whose sum is σ = 66910694. Its totient is φ = 66910692.

The previous prime is 66910687. The next prime is 66910769. The reversal of 66910693 is 39601966.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37675044 + 29235649 = 6138^2 + 5407^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66910693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66910633) 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, 33455346 + 33455347.

It is an arithmetic number, because the mean of its divisors is an integer number (33455347).

Almost surely, 2^66910693 is an apocalyptic number.

It is an amenable number.

66910693 is a deficient number, since it is larger than the sum of its proper divisors (1).

66910693 is an equidigital number, since it uses as much as digits as its factorization.

66910693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52488, while the sum is 40.

The square root of 66910693 is about 8179.8956594812. The cubic root of 66910693 is about 405.9742697664.

The spelling of 66910693 in words is "sixty-six million, nine hundred ten thousand, six hundred ninety-three".