206980817568 has 48 divisors (see below), whose sum is σ = 620942454720. Its totient is φ = 59137376256.

The previous prime is 206980817551. The next prime is 206980817663. The reversal of 206980817568 is 865718089602.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×206980817568² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154002913 + ... + 154004256.

It is an arithmetic number, because the mean of its divisors is an integer number (12936301140).

Almost surely, 2^206980817568 is an apocalyptic number.

206980817568 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

206980817568 is an abundant number, since it is smaller than the sum of its proper divisors (413961637152).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

206980817568 is a wasteful number, since it uses less digits than its factorization.

206980817568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308007189 (or 308007181 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 60.

The spelling of 206980817568 in words is "two hundred six billion, nine hundred eighty million, eight hundred seventeen thousand, five hundred sixty-eight".