66783545471 has 2 divisors, whose sum is σ = 66783545472. Its totient is φ = 66783545470.

The previous prime is 66783545461. The next prime is 66783545509. The reversal of 66783545471 is 17454538766.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66783545471 is a prime.

It is a super-3 number, since 3×66783545471³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66783545461) 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, 33391772735 + 33391772736.

It is an arithmetic number, because the mean of its divisors is an integer number (33391772736).

Almost surely, 2^66783545471 is an apocalyptic number.

66783545471 is a deficient number, since it is larger than the sum of its proper divisors (1).

66783545471 is an equidigital number, since it uses as much as digits as its factorization.

66783545471 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16934400, while the sum is 56.

The spelling of 66783545471 in words is "sixty-six billion, seven hundred eighty-three million, five hundred forty-five thousand, four hundred seventy-one".