66117071156255 has 16 divisors (see below), whose sum is σ = 91822623237120. Its totient is φ = 44763528824352.

The previous prime is 66117071156221. The next prime is 66117071156261. The reversal of 66117071156255 is 55265117071166.

It is a cyclic number.

It is not a de Polignac number, because 66117071156255 - 2¹² = 66117071152159 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66117071156197 and 66117071156206.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11956067969 + ... + 11956073498.

It is an arithmetic number, because the mean of its divisors is an integer number (5738913952320).

Almost surely, 2^{66117071156255} is an apocalyptic number.

66117071156255 is a deficient number, since it is larger than the sum of its proper divisors (25705552080865).

66117071156255 is a wasteful number, since it uses less digits than its factorization.

66117071156255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23912141558.

The product of its (nonzero) digits is 2646000, while the sum is 53.

The spelling of 66117071156255 in words is "sixty-six trillion, one hundred seventeen billion, seventy-one million, one hundred fifty-six thousand, two hundred fifty-five".