4066652165221 has 2 divisors, whose sum is σ = 4066652165222. Its totient is φ = 4066652165220.

The previous prime is 4066652165209. The next prime is 4066652165231. The reversal of 4066652165221 is 1225612566604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3635462942721 + 431189222500 = 1906689^2 + 656650^2 .

It is a cyclic number.

It is not a de Polignac number, because 4066652165221 - 2²¹ = 4066650068069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4066652165201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2033326082610 + 2033326082611.

It is an arithmetic number, because the mean of its divisors is an integer number (2033326082611).

Almost surely, 2^{4066652165221} is an apocalyptic number.

It is an amenable number.

4066652165221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4066652165221 is an equidigital number, since it uses as much as digits as its factorization.

4066652165221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1036800, while the sum is 46.

The spelling of 4066652165221 in words is "four trillion, sixty-six billion, six hundred fifty-two million, one hundred sixty-five thousand, two hundred twenty-one".