218166707738 has 64 divisors (see below), whose sum is σ = 416731392000. Its totient is φ = 83535447744.

The previous prime is 218166707687. The next prime is 218166707791. The reversal of 218166707738 is 837707661812.

It is a happy number.

218166707738 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2843 + ... + 660561.

It is an arithmetic number, because the mean of its divisors is an integer number (6511428000).

Almost surely, 2^218166707738 is an apocalyptic number.

218166707738 is a deficient number, since it is larger than the sum of its proper divisors (198564684262).

218166707738 is a wasteful number, since it uses less digits than its factorization.

218166707738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657819.

The product of its (nonzero) digits is 4741632, while the sum is 56.

The spelling of 218166707738 in words is "two hundred eighteen billion, one hundred sixty-six million, seven hundred seven thousand, seven hundred thirty-eight".