66746887871 has 2 divisors, whose sum is σ = 66746887872. Its totient is φ = 66746887870.

The previous prime is 66746887787. The next prime is 66746887913. The reversal of 66746887871 is 17878864766.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66746887871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66746881871) 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, 33373443935 + 33373443936.

It is an arithmetic number, because the mean of its divisors is an integer number (33373443936).

Almost surely, 2^66746887871 is an apocalyptic number.

66746887871 is a deficient number, since it is larger than the sum of its proper divisors (1).

66746887871 is an equidigital number, since it uses as much as digits as its factorization.

66746887871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 151732224, while the sum is 68.

The spelling of 66746887871 in words is "sixty-six billion, seven hundred forty-six million, eight hundred eighty-seven thousand, eight hundred seventy-one".