66715700120066 has 16 divisors (see below), whose sum is σ = 102203731069056. Its totient is φ = 32647803047376.

The previous prime is 66715700120059. The next prime is 66715700120071. The reversal of 66715700120066 is 66002100751766.

66715700120066 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a self number, because there is not a number n which added to its sum of digits gives 66715700120066.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 6945305 + ... + 13478451.

It is an arithmetic number, because the mean of its divisors is an integer number (6387733191816).

Almost surely, 2^{66715700120066} is an apocalyptic number.

66715700120066 is a deficient number, since it is larger than the sum of its proper divisors (35488030948990).

66715700120066 is a wasteful number, since it uses less digits than its factorization.

66715700120066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6641833.

The product of its (nonzero) digits is 635040, while the sum is 47.

The spelling of 66715700120066 in words is "sixty-six trillion, seven hundred fifteen billion, seven hundred million, one hundred twenty thousand, sixty-six".