66774247766 has 16 divisors (see below), whose sum is σ = 101165215680. Its totient is φ = 33052588800.

The previous prime is 66774247741. The next prime is 66774247781.

It is a happy number.

66774247766 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 66774247699 and 66774247708.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2387270 + ... + 2415078.

It is an arithmetic number, because the mean of its divisors is an integer number (6322825980).

Almost surely, 2^66774247766 is an apocalyptic number.

66774247766 is a deficient number, since it is larger than the sum of its proper divisors (34390967914).

66774247766 is a wasteful number, since it uses less digits than its factorization.

66774247766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39799.

The product of its digits is 99574272, while the sum is 62.

The spelling of 66774247766 in words is "sixty-six billion, seven hundred seventy-four million, two hundred forty-seven thousand, seven hundred sixty-six".