681004903520 has 24 divisors (see below), whose sum is σ = 1608874084944. Its totient is φ = 272401961344.

The previous prime is 681004903499. The next prime is 681004903549. The reversal of 681004903520 is 25309400186.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2128140164 + ... + 2128140483.

It is an arithmetic number, because the mean of its divisors is an integer number (67036420206).

Almost surely, 2^681004903520 is an apocalyptic number.

It is an amenable number.

681004903520 is an abundant number, since it is smaller than the sum of its proper divisors (927869181424).

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

681004903520 is a wasteful number, since it uses less digits than its factorization.

681004903520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4256280662 (or 4256280654 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 38.

The spelling of 681004903520 in words is "six hundred eighty-one billion, four million, nine hundred three thousand, five hundred twenty".