66186846685 has 4 divisors (see below), whose sum is σ = 79424216028. Its totient is φ = 52949477344.

The previous prime is 66186846611. The next prime is 66186846703. The reversal of 66186846685 is 58664868166.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42477622201 + 23709224484 = 206101^2 + 153978^2 .

It is a cyclic number.

It is not a de Polignac number, because 66186846685 - 2¹³ = 66186838493 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 6618684664 + ... + 6618684673.

It is an arithmetic number, because the mean of its divisors is an integer number (19856054007).

Almost surely, 2^66186846685 is an apocalyptic number.

It is an amenable number.

66186846685 is a deficient number, since it is larger than the sum of its proper divisors (13237369343).

66186846685 is a wasteful number, since it uses less digits than its factorization.

66186846685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13237369342.

The product of its digits is 79626240, while the sum is 64.

The spelling of 66186846685 in words is "sixty-six billion, one hundred eighty-six million, eight hundred forty-six thousand, six hundred eighty-five".