66188566863 has 6 divisors (see below), whose sum is σ = 95605707704. Its totient is φ = 44125711236.

The previous prime is 66188566841. The next prime is 66188566889. The reversal of 66188566863 is 36866588166.

66188566863 is a `hidden beast` number, since 6 + 6 + 1 + 8 + 8 + 566 + 8 + 63 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-66188566863 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66188566863.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66188566363) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 3677142595 + ... + 3677142612.

Almost surely, 2^66188566863 is an apocalyptic number.

66188566863 is a deficient number, since it is larger than the sum of its proper divisors (29417140841).

66188566863 is a wasteful number, since it uses less digits than its factorization.

66188566863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7354285213 (or 7354285210 counting only the distinct ones).

The product of its digits is 59719680, while the sum is 63.

The spelling of 66188566863 in words is "sixty-six billion, one hundred eighty-eight million, five hundred sixty-six thousand, eight hundred sixty-three".