66530513201 has 2 divisors, whose sum is σ = 66530513202. Its totient is φ = 66530513200.

The previous prime is 66530513167. The next prime is 66530513209. The reversal of 66530513201 is 10231503566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65844073201 + 686440000 = 256601^2 + 26200^2 .

It is a cyclic number.

It is not a de Polignac number, because 66530513201 - 2¹⁰ = 66530512177 is a prime.

It is not a weakly prime, because it can be changed into another prime (66530513209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33265256600 + 33265256601.

It is an arithmetic number, because the mean of its divisors is an integer number (33265256601).

Almost surely, 2^66530513201 is an apocalyptic number.

It is an amenable number.

66530513201 is a deficient number, since it is larger than the sum of its proper divisors (1).

66530513201 is an equidigital number, since it uses as much as digits as its factorization.

66530513201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 32.

The spelling of 66530513201 in words is "sixty-six billion, five hundred thirty million, five hundred thirteen thousand, two hundred one".