206378652818 has 16 divisors (see below), whose sum is σ = 352991542680. Its totient is φ = 89648645376.

The previous prime is 206378652817. The next prime is 206378652829. The reversal of 206378652818 is 818256873602.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 185143460089 + 21235192729 = 430283^2 + 145723^2 .

It is a super-2 number, since 2×206378652818² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (206378652811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 233459573 + ... + 233460456.

Almost surely, 2^206378652818 is an apocalyptic number.

206378652818 is a deficient number, since it is larger than the sum of its proper divisors (146612889862).

206378652818 is a wasteful number, since it uses less digits than its factorization.

206378652818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466920061.

The product of its (nonzero) digits is 7741440, while the sum is 56.

The spelling of 206378652818 in words is "two hundred six billion, three hundred seventy-eight million, six hundred fifty-two thousand, eight hundred eighteen".