66770711057 has 2 divisors, whose sum is σ = 66770711058. Its totient is φ = 66770711056.

The previous prime is 66770711047. The next prime is 66770711083. The reversal of 66770711057 is 75011707766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63261807361 + 3508903696 = 251519^2 + 59236^2 .

It is a cyclic number.

It is not a de Polignac number, because 66770711057 - 2⁴ = 66770711041 is a prime.

It is not a weakly prime, because it can be changed into another prime (66770711017) 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, 33385355528 + 33385355529.

It is an arithmetic number, because the mean of its divisors is an integer number (33385355529).

Almost surely, 2^66770711057 is an apocalyptic number.

It is an amenable number.

66770711057 is a deficient number, since it is larger than the sum of its proper divisors (1).

66770711057 is an equidigital number, since it uses as much as digits as its factorization.

66770711057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432180, while the sum is 47.

The spelling of 66770711057 in words is "sixty-six billion, seven hundred seventy million, seven hundred eleven thousand, fifty-seven".