681340856028288 has 64 divisors (see below), whose sum is σ = 1824062134379520. Its totient is φ = 225325322449920.

The previous prime is 681340856028271. The next prime is 681340856028311. The reversal of 681340856028288 is 882820658043186.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6985483303 + ... + 6985580838.

It is an arithmetic number, because the mean of its divisors is an integer number (28500970849680).

Almost surely, 2^{681340856028288} is an apocalyptic number.

It is an amenable number.

681340856028288 is an abundant number, since it is smaller than the sum of its proper divisors (1142721278351232).

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

681340856028288 is a wasteful number, since it uses less digits than its factorization.

681340856028288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13971064285 (or 13971064273 counting only the distinct ones).

The product of its (nonzero) digits is 283115520, while the sum is 69.

The spelling of 681340856028288 in words is "six hundred eighty-one trillion, three hundred forty billion, eight hundred fifty-six million, twenty-eight thousand, two hundred eighty-eight".