66717852847 has 2 divisors, whose sum is σ = 66717852848. Its totient is φ = 66717852846.

The previous prime is 66717852827. The next prime is 66717852863. The reversal of 66717852847 is 74825871766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66717852847 - 2¹⁵ = 66717820079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66717852827) 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, 33358926423 + 33358926424.

It is an arithmetic number, because the mean of its divisors is an integer number (33358926424).

Almost surely, 2^66717852847 is an apocalyptic number.

66717852847 is a deficient number, since it is larger than the sum of its proper divisors (1).

66717852847 is an equidigital number, since it uses as much as digits as its factorization.

66717852847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31610880, while the sum is 61.

The spelling of 66717852847 in words is "sixty-six billion, seven hundred seventeen million, eight hundred fifty-two thousand, eight hundred forty-seven".