681849133680 has 160 divisors (see below), whose sum is σ = 2483266060800. Its totient is φ = 152581616640.

The previous prime is 681849133627. The next prime is 681849133717. The reversal of 681849133680 is 86331948186.

It is a super-2 number, since 2×681849133680² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 681849133680.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9899380 + ... + 9968019.

It is an arithmetic number, because the mean of its divisors is an integer number (15520412880).

Almost surely, 2^681849133680 is an apocalyptic number.

681849133680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

681849133680 is an abundant number, since it is smaller than the sum of its proper divisors (1801416927120).

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

681849133680 is a wasteful number, since it uses less digits than its factorization.

681849133680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19867439 (or 19867433 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 57.

The spelling of 681849133680 in words is "six hundred eighty-one billion, eight hundred forty-nine million, one hundred thirty-three thousand, six hundred eighty".