681336751344 has 160 divisors (see below), whose sum is σ = 1929321426240. Its totient is φ = 206231961600.

The previous prime is 681336751339. The next prime is 681336751357. The reversal of 681336751344 is 443157633186.

681336751344 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (51).

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, 35036664 + ... + 35056104.

It is an arithmetic number, because the mean of its divisors is an integer number (12058258914).

Almost surely, 2^681336751344 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681336751344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (964660713120).

681336751344 is an abundant number, since it is smaller than the sum of its proper divisors (1247984674896).

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

681336751344 is a wasteful number, since it uses less digits than its factorization.

681336751344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20979 (or 20973 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 51.

The spelling of 681336751344 in words is "six hundred eighty-one billion, three hundred thirty-six million, seven hundred fifty-one thousand, three hundred forty-four".