681749050444 has 96 divisors (see below), whose sum is σ = 1528795376640. Its totient is φ = 258244588800.

The previous prime is 681749050441. The next prime is 681749050453. The reversal of 681749050444 is 444050947186.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 681749050391 and 681749050400.

It is not an unprimeable number, because it can be changed into a prime (681749050441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15716217 + ... + 15759535.

It is an arithmetic number, because the mean of its divisors is an integer number (15924951840).

Almost surely, 2^681749050444 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 681749050444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (764397688320).

681749050444 is an abundant number, since it is smaller than the sum of its proper divisors (847046326196).

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

681749050444 is a wasteful number, since it uses less digits than its factorization.

681749050444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44759 (or 44757 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 52.

The spelling of 681749050444 in words is "six hundred eighty-one billion, seven hundred forty-nine million, fifty thousand, four hundred forty-four".