66186657805 has 16 divisors (see below), whose sum is σ = 83202796800. Its totient is φ = 50476345920.

The previous prime is 66186657791. The next prime is 66186657827. The reversal of 66186657805 is 50875668166.

It is not a de Polignac number, because 66186657805 - 2²⁹ = 65649786893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66186657805.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2877531 + ... + 2900440.

It is an arithmetic number, because the mean of its divisors is an integer number (5200174800).

Almost surely, 2^66186657805 is an apocalyptic number.

It is an amenable number.

66186657805 is a deficient number, since it is larger than the sum of its proper divisors (17016138995).

66186657805 is a wasteful number, since it uses less digits than its factorization.

66186657805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5778084.

The product of its (nonzero) digits is 14515200, while the sum is 58.

The spelling of 66186657805 in words is "sixty-six billion, one hundred eighty-six million, six hundred fifty-seven thousand, eight hundred five".