66677780447 has 2 divisors, whose sum is σ = 66677780448. Its totient is φ = 66677780446.

The previous prime is 66677780441. The next prime is 66677780497. The reversal of 66677780447 is 74408777666.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66677780447 is a prime.

It is a super-3 number, since 3×66677780447³ (a number of 33 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66677780447.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66677780441) 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, 33338890223 + 33338890224.

It is an arithmetic number, because the mean of its divisors is an integer number (33338890224).

Almost surely, 2^66677780447 is an apocalyptic number.

66677780447 is a deficient number, since it is larger than the sum of its proper divisors (1).

66677780447 is an equidigital number, since it uses as much as digits as its factorization.

66677780447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 66382848, while the sum is 62.

The spelling of 66677780447 in words is "sixty-six billion, six hundred seventy-seven million, seven hundred eighty thousand, four hundred forty-seven".