66770666497 has 2 divisors, whose sum is σ = 66770666498. Its totient is φ = 66770666496.

The previous prime is 66770666491. The next prime is 66770666503. The reversal of 66770666497 is 79466607766.

It is a balanced prime because it is at equal distance from previous prime (66770666491) and next prime (66770666503).

It can be written as a sum of positive squares in only one way, i.e., 57950451441 + 8820215056 = 240729^2 + 93916^2 .

It is a cyclic number.

It is not a de Polignac number, because 66770666497 - 2³⁵ = 32410928129 is a prime.

It is not a weakly prime, because it can be changed into another prime (66770666491) 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, 33385333248 + 33385333249.

It is an arithmetic number, because the mean of its divisors is an integer number (33385333249).

Almost surely, 2^66770666497 is an apocalyptic number.

It is an amenable number.

66770666497 is a deficient number, since it is larger than the sum of its proper divisors (1).

66770666497 is an equidigital number, since it uses as much as digits as its factorization.

66770666497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96018048, while the sum is 64.

The spelling of 66770666497 in words is "sixty-six billion, seven hundred seventy million, six hundred sixty-six thousand, four hundred ninety-seven".