66542201273 has 2 divisors, whose sum is σ = 66542201274. Its totient is φ = 66542201272.

The previous prime is 66542201237. The next prime is 66542201291. The reversal of 66542201273 is 37210224566.

Together with previous prime (66542201237) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59559426304 + 6982774969 = 244048^2 + 83563^2 .

It is a cyclic number.

It is not a de Polignac number, because 66542201273 - 2¹⁴ = 66542184889 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (66542204273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33271100636 + 33271100637.

It is an arithmetic number, because the mean of its divisors is an integer number (33271100637).

Almost surely, 2^66542201273 is an apocalyptic number.

It is an amenable number.

66542201273 is a deficient number, since it is larger than the sum of its proper divisors (1).

66542201273 is an equidigital number, since it uses as much as digits as its factorization.

66542201273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120960, while the sum is 38.

The spelling of 66542201273 in words is "sixty-six billion, five hundred forty-two million, two hundred one thousand, two hundred seventy-three".