66784648766 has 48 divisors (see below), whose sum is σ = 116153049600. Its totient is φ = 28697953680.

The previous prime is 66784648703. The next prime is 66784648769.

66784648766 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 66784648696 and 66784648705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66784648769) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2187281 + ... + 2217603.

It is an arithmetic number, because the mean of its divisors is an integer number (2419855200).

Almost surely, 2^66784648766 is an apocalyptic number.

66784648766 is a deficient number, since it is larger than the sum of its proper divisors (49368400834).

66784648766 is a wasteful number, since it uses less digits than its factorization.

66784648766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30845 (or 30834 counting only the distinct ones).

The product of its digits is 390168576, while the sum is 68.

The spelling of 66784648766 in words is "sixty-six billion, seven hundred eighty-four million, six hundred forty-eight thousand, seven hundred sixty-six".