66885700018 has 8 divisors (see below), whose sum is σ = 101702913948. Its totient is φ = 32984728704.

The previous prime is 66885699973. The next prime is 66885700027. The reversal of 66885700018 is 81000758866.

It can be written as a sum of positive squares in 2 ways, for example, as 63571049689 + 3314650329 = 252133^2 + 57573^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 229060471 + ... + 229060762.

Almost surely, 2^66885700018 is an apocalyptic number.

66885700018 is a deficient number, since it is larger than the sum of its proper divisors (34817213930).

66885700018 is a wasteful number, since it uses less digits than its factorization.

66885700018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458121308.

The product of its (nonzero) digits is 645120, while the sum is 49.

The spelling of 66885700018 in words is "sixty-six billion, eight hundred eighty-five million, seven hundred thousand, eighteen".