681831198720 has 1040 divisors, whose sum is σ = 2836131522048. Its totient is φ = 153466306560.

The previous prime is 681831198703. The next prime is 681831198733. The reversal of 681831198720 is 27891138186.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 824462947 + ... + 824463773.

Almost surely, 2^681831198720 is an apocalyptic number.

681831198720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681831198720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1418065761024).

681831198720 is an abundant number, since it is smaller than the sum of its proper divisors (2154300323328).

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

681831198720 is an equidigital number, since it uses as much as digits as its factorization.

681831198720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 946 (or 915 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 54.

The spelling of 681831198720 in words is "six hundred eighty-one billion, eight hundred thirty-one million, one hundred ninety-eight thousand, seven hundred twenty".