681980801188 has 48 divisors (see below), whose sum is σ = 1217786791536. Its totient is φ = 334106449920.

The previous prime is 681980801153. The next prime is 681980801191. The reversal of 681980801188 is 881108089186.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 86601895524 + 595378905664 = 294282^2 + 771608^2 .

It is a super-3 number, since 3×681980801188³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72384718 + ... + 72394138.

It is an arithmetic number, because the mean of its divisors is an integer number (25370558157).

Almost surely, 2^681980801188 is an apocalyptic number.

It is an amenable number.

681980801188 is a deficient number, since it is larger than the sum of its proper divisors (535805990348).

681980801188 is a wasteful number, since it uses less digits than its factorization.

681980801188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11104 (or 11102 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 58.

The spelling of 681980801188 in words is "six hundred eighty-one billion, nine hundred eighty million, eight hundred one thousand, one hundred eighty-eight".