66670776763 has 2 divisors, whose sum is σ = 66670776764. Its totient is φ = 66670776762.

The previous prime is 66670776761. The next prime is 66670776791. The reversal of 66670776763 is 36767707666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66670776763 - 2¹ = 66670776761 is a prime.

Together with 66670776761, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66670776761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33335388381 + 33335388382.

It is an arithmetic number, because the mean of its divisors is an integer number (33335388382).

Almost surely, 2^66670776763 is an apocalyptic number.

66670776763 is a deficient number, since it is larger than the sum of its proper divisors (1).

66670776763 is an equidigital number, since it uses as much as digits as its factorization.

66670776763 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56010528, while the sum is 61.

The spelling of 66670776763 in words is "sixty-six billion, six hundred seventy million, seven hundred seventy-six thousand, seven hundred sixty-three".