218944206968290 has 16 divisors (see below), whose sum is σ = 396609760905912. Its totient is φ = 87019863151104.

The previous prime is 218944206968269. The next prime is 218944206968369. The reversal of 218944206968290 is 92869602449812.

It can be written as a sum of positive squares in 4 ways, for example, as 72391900605649 + 146552306362641 = 8508343^2 + 12105879^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69727452879 + ... + 69727456018.

Almost surely, 2^{218944206968290} is an apocalyptic number.

218944206968290 is a deficient number, since it is larger than the sum of its proper divisors (177665553937622).

218944206968290 is a wasteful number, since it uses less digits than its factorization.

218944206968290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139454909061.

The product of its (nonzero) digits is 214990848, while the sum is 70.

The spelling of 218944206968290 in words is "two hundred eighteen trillion, nine hundred forty-four billion, two hundred six million, nine hundred sixty-eight thousand, two hundred ninety".