681688118064 has 80 divisors (see below), whose sum is σ = 1840322068992. Its totient is φ = 217222704384.

The previous prime is 681688118063. The next prime is 681688118179. The reversal of 681688118064 is 460811886186.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 681688117995 and 681688118013.

It is not an unprimeable number, because it can be changed into a prime (681688118063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3416559 + ... + 3610574.

Almost surely, 2^681688118064 is an apocalyptic number.

It is an amenable number.

681688118064 is an abundant number, since it is smaller than the sum of its proper divisors (1158633950928).

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

681688118064 is a wasteful number, since it uses less digits than its factorization.

681688118064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7027234 (or 7027228 counting only the distinct ones).

The product of its (nonzero) digits is 3538944, while the sum is 57.

The spelling of 681688118064 in words is "six hundred eighty-one billion, six hundred eighty-eight million, one hundred eighteen thousand, sixty-four".