66127703270509 has 2 divisors, whose sum is σ = 66127703270510. Its totient is φ = 66127703270508.

The previous prime is 66127703270501. The next prime is 66127703270627. The reversal of 66127703270509 is 90507230772166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65136553601284 + 991149669225 = 8070722^2 + 995565^2 .

It is a cyclic number.

It is not a de Polignac number, because 66127703270509 - 2³ = 66127703270501 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66127703270509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66127703270501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33063851635254 + 33063851635255.

It is an arithmetic number, because the mean of its divisors is an integer number (33063851635255).

Almost surely, 2^{66127703270509} is an apocalyptic number.

It is an amenable number.

66127703270509 is a deficient number, since it is larger than the sum of its proper divisors (1).

66127703270509 is an equidigital number, since it uses as much as digits as its factorization.

66127703270509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6667920, while the sum is 55.

The spelling of 66127703270509 in words is "sixty-six trillion, one hundred twenty-seven billion, seven hundred three million, two hundred seventy thousand, five hundred nine".