66776514127727 has 2 divisors, whose sum is σ = 66776514127728. Its totient is φ = 66776514127726.

The previous prime is 66776514127667. The next prime is 66776514127751. The reversal of 66776514127727 is 72772141567766.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66776514127727 - 2⁸ = 66776514127471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66776514127777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33388257063863 + 33388257063864.

It is an arithmetic number, because the mean of its divisors is an integer number (33388257063864).

Almost surely, 2^{66776514127727} is an apocalyptic number.

66776514127727 is a deficient number, since it is larger than the sum of its proper divisors (1).

66776514127727 is an equidigital number, since it uses as much as digits as its factorization.

66776514127727 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290424960, while the sum is 68.

The spelling of 66776514127727 in words is "sixty-six trillion, seven hundred seventy-six billion, five hundred fourteen million, one hundred twenty-seven thousand, seven hundred twenty-seven".