66801046771 has 2 divisors, whose sum is σ = 66801046772. Its totient is φ = 66801046770.

The previous prime is 66801046769. The next prime is 66801046903. The reversal of 66801046771 is 17764010866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66801046771 - 2¹ = 66801046769 is a prime.

Together with 66801046769, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66801046471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33400523385 + 33400523386.

It is an arithmetic number, because the mean of its divisors is an integer number (33400523386).

Almost surely, 2^66801046771 is an apocalyptic number.

66801046771 is a deficient number, since it is larger than the sum of its proper divisors (1).

66801046771 is an equidigital number, since it uses as much as digits as its factorization.

66801046771 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 338688, while the sum is 46.

The spelling of 66801046771 in words is "sixty-six billion, eight hundred one million, forty-six thousand, seven hundred seventy-one".