66031843618 has 8 divisors (see below), whose sum is σ = 106666824348. Its totient is φ = 30476235504.

The previous prime is 66031843607. The next prime is 66031843711. The reversal of 66031843618 is 81634813066.

It can be written as a sum of positive squares in 2 ways, for example, as 64132017049 + 1899826569 = 253243^2 + 43587^2 .

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 (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1269843121 + ... + 1269843172.

Almost surely, 2^66031843618 is an apocalyptic number.

66031843618 is a deficient number, since it is larger than the sum of its proper divisors (40634980730).

66031843618 is a wasteful number, since it uses less digits than its factorization.

66031843618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2539686308.

The product of its (nonzero) digits is 497664, while the sum is 46.

The spelling of 66031843618 in words is "sixty-six billion, thirty-one million, eight hundred forty-three thousand, six hundred eighteen".