66511116775004 has 24 divisors (see below), whose sum is σ = 127258565238000. Its totient is φ = 30164993223680.

The previous prime is 66511116774931. The next prime is 66511116775007. The reversal of 66511116775004 is 40057761111566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66511116775007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1683294599 + ... + 1683334110.

It is an arithmetic number, because the mean of its divisors is an integer number (5302440218250).

Almost surely, 2^{66511116775004} is an apocalyptic number.

It is an amenable number.

66511116775004 is a deficient number, since it is larger than the sum of its proper divisors (60747448462996).

66511116775004 is a wasteful number, since it uses less digits than its factorization.

66511116775004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3366629173 (or 3366629171 counting only the distinct ones).

The product of its (nonzero) digits is 1058400, while the sum is 50.

The spelling of 66511116775004 in words is "sixty-six trillion, five hundred eleven billion, one hundred sixteen million, seven hundred seventy-five thousand, four".