66850660801 has 2 divisors, whose sum is σ = 66850660802. Its totient is φ = 66850660800.

The previous prime is 66850660757. The next prime is 66850660823. The reversal of 66850660801 is 10806605866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46504491201 + 20346169600 = 215649^2 + 142640^2 .

It is a cyclic number.

It is not a de Polignac number, because 66850660801 - 2²³ = 66842272193 is a prime.

It is not a weakly prime, because it can be changed into another prime (66850660001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33425330400 + 33425330401.

It is an arithmetic number, because the mean of its divisors is an integer number (33425330401).

Almost surely, 2^66850660801 is an apocalyptic number.

It is an amenable number.

66850660801 is a deficient number, since it is larger than the sum of its proper divisors (1).

66850660801 is an equidigital number, since it uses as much as digits as its factorization.

66850660801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 414720, while the sum is 46.

The spelling of 66850660801 in words is "sixty-six billion, eight hundred fifty million, six hundred sixty thousand, eight hundred one".