66305500801 has 2 divisors, whose sum is σ = 66305500802. Its totient is φ = 66305500800.

The previous prime is 66305500777. The next prime is 66305500853. The reversal of 66305500801 is 10800550366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46203932401 + 20101568400 = 214951^2 + 141780^2 .

It is a cyclic number.

It is not a de Polignac number, because 66305500801 - 2⁵ = 66305500769 is a prime.

It is not a weakly prime, because it can be changed into another prime (66305500861) 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, 33152750400 + 33152750401.

It is an arithmetic number, because the mean of its divisors is an integer number (33152750401).

Almost surely, 2^66305500801 is an apocalyptic number.

It is an amenable number.

66305500801 is a deficient number, since it is larger than the sum of its proper divisors (1).

66305500801 is an equidigital number, since it uses as much as digits as its factorization.

66305500801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 34.

The spelling of 66305500801 in words is "sixty-six billion, three hundred five million, five hundred thousand, eight hundred one".