66685316155775 has 24 divisors (see below), whose sum is σ = 82767647888640. Its totient is φ = 53298032286560.

The previous prime is 66685316155751. The next prime is 66685316155789. The reversal of 66685316155775 is 57755161358666.

It is not a de Polignac number, because 66685316155775 - 2²⁰ = 66685315107199 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66685316155699 and 66685316155708.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 314656796 + ... + 314868654.

It is an arithmetic number, because the mean of its divisors is an integer number (3448651995360).

Almost surely, 2^{66685316155775} is an apocalyptic number.

66685316155775 is a deficient number, since it is larger than the sum of its proper divisors (16082331732865).

66685316155775 is a wasteful number, since it uses less digits than its factorization.

66685316155775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223663 (or 223658 counting only the distinct ones).

The product of its digits is 952560000, while the sum is 71.

The spelling of 66685316155775 in words is "sixty-six trillion, six hundred eighty-five billion, three hundred sixteen million, one hundred fifty-five thousand, seven hundred seventy-five".