66201643873 has 2 divisors, whose sum is σ = 66201643874. Its totient is φ = 66201643872.

The previous prime is 66201643853. The next prime is 66201643883. The reversal of 66201643873 is 37834610266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53161602624 + 13040041249 = 230568^2 + 114193^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66201643873 is a prime.

It is not a weakly prime, because it can be changed into another prime (66201643813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33100821936 + 33100821937.

It is an arithmetic number, because the mean of its divisors is an integer number (33100821937).

Almost surely, 2^66201643873 is an apocalyptic number.

It is an amenable number.

66201643873 is a deficient number, since it is larger than the sum of its proper divisors (1).

66201643873 is an equidigital number, since it uses as much as digits as its factorization.

66201643873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 870912, while the sum is 46.

The spelling of 66201643873 in words is "sixty-six billion, two hundred one million, six hundred forty-three thousand, eight hundred seventy-three".