66611065166605 has 16 divisors (see below), whose sum is σ = 80568764928000. Its totient is φ = 52865257761792.

The previous prime is 66611065166593. The next prime is 66611065166627. The reversal of 66611065166605 is 50666156011666.

It is a cyclic number.

It is not a de Polignac number, because 66611065166605 - 2¹⁷ = 66611065035533 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4454352 + ... + 12371878.

It is an arithmetic number, because the mean of its divisors is an integer number (5035547808000).

Almost surely, 2^{66611065166605} is an apocalyptic number.

It is an amenable number.

66611065166605 is a deficient number, since it is larger than the sum of its proper divisors (13957699761395).

66611065166605 is a wasteful number, since it uses less digits than its factorization.

66611065166605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7930908.

The product of its (nonzero) digits is 6998400, while the sum is 55.

The spelling of 66611065166605 in words is "sixty-six trillion, six hundred eleven billion, sixty-five million, one hundred sixty-six thousand, six hundred five".