217668078853 has 16 divisors (see below), whose sum is σ = 224053885440. Its totient is φ = 211335350400.

The previous prime is 217668078791. The next prime is 217668078889. The reversal of 217668078853 is 358870866712.

It is a cyclic number.

It is not a de Polignac number, because 217668078853 - 2¹⁷ = 217667947781 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 217668078791 and 217668078800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217668078053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10200351 + ... + 10221667.

It is an arithmetic number, because the mean of its divisors is an integer number (14003367840).

Almost surely, 2^217668078853 is an apocalyptic number.

It is an amenable number.

217668078853 is a deficient number, since it is larger than the sum of its proper divisors (6385806587).

217668078853 is a wasteful number, since it uses less digits than its factorization.

217668078853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22548.

The product of its (nonzero) digits is 27095040, while the sum is 61.

The spelling of 217668078853 in words is "two hundred seventeen billion, six hundred sixty-eight million, seventy-eight thousand, eight hundred fifty-three".