3520018666685 has 8 divisors (see below), whose sum is σ = 4226079900120. Its totient is φ = 2814643266624.

The previous prime is 3520018666649. The next prime is 3520018666687. The reversal of 3520018666685 is 5866668100253.

It can be written as a sum of positive squares in 4 ways, for example, as 786878991844 + 2733139674841 = 887062^2 + 1653221^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 3520018666685 - 2¹⁶ = 3520018601149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3520018666685.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3520018666687) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 171447050 + ... + 171467579.

It is an arithmetic number, because the mean of its divisors is an integer number (528259987515).

Almost surely, 2^{3520018666685} is an apocalyptic number.

It is an amenable number.

3520018666685 is a deficient number, since it is larger than the sum of its proper divisors (706061233435).

3520018666685 is a wasteful number, since it uses less digits than its factorization.

3520018666685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342916687.

The product of its (nonzero) digits is 12441600, while the sum is 56.

The spelling of 3520018666685 in words is "three trillion, five hundred twenty billion, eighteen million, six hundred sixty-six thousand, six hundred eighty-five".