641726583860 has 96 divisors (see below), whose sum is σ = 1489915607040. Its totient is φ = 230935339008.

The previous prime is 641726583857. The next prime is 641726583881. The reversal of 641726583860 is 68385627146.

It is a super-2 number, since 2×641726583860² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 641726583796 and 641726583805.

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, 12227756 + ... + 12280124.

It is an arithmetic number, because the mean of its divisors is an integer number (15519954240).

Almost surely, 2^641726583860 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 641726583860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (744957803520).

641726583860 is an abundant number, since it is smaller than the sum of its proper divisors (848189023180).

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

641726583860 is a wasteful number, since it uses less digits than its factorization.

641726583860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53985 (or 53983 counting only the distinct ones).

The product of its (nonzero) digits is 11612160, while the sum is 56.

The spelling of 641726583860 in words is "six hundred forty-one billion, seven hundred twenty-six million, five hundred eighty-three thousand, eight hundred sixty".