206801864918 has 16 divisors (see below), whose sum is σ = 338417128656. Its totient is φ = 93996937440.

The previous prime is 206801864903. The next prime is 206801864921. The reversal of 206801864918 is 819468108602.

It is a happy number.

It is a super-2 number, since 2×206801864918² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 206801864918.

It is a congruent number.

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, 383480 + ... + 748772.

It is an arithmetic number, because the mean of its divisors is an integer number (21151070541).

Almost surely, 2^206801864918 is an apocalyptic number.

206801864918 is a deficient number, since it is larger than the sum of its proper divisors (131615263738).

206801864918 is a wasteful number, since it uses less digits than its factorization.

206801864918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391039.

The product of its (nonzero) digits is 1327104, while the sum is 53.

The spelling of 206801864918 in words is "two hundred six billion, eight hundred one million, eight hundred sixty-four thousand, nine hundred eighteen".