641694281140968 has 256 divisors, whose sum is σ = 1775890001571840. Its totient is φ = 191604940416000.

The previous prime is 641694281140963. The next prime is 641694281141009. The reversal of 641694281140968 is 869041182496146.

It is not an unprimeable number, because it can be changed into a prime (641694281140961) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5345298721 + ... + 5345418767.

It is an arithmetic number, because the mean of its divisors is an integer number (6937070318640).

Almost surely, 2^{641694281140968} 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 641694281140968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (887945000785920).

641694281140968 is an abundant number, since it is smaller than the sum of its proper divisors (1134195720430872).

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

641694281140968 is a wasteful number, since it uses less digits than its factorization.

641694281140968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121128 (or 121124 counting only the distinct ones).

The product of its (nonzero) digits is 143327232, while the sum is 69.

The spelling of 641694281140968 in words is "six hundred forty-one trillion, six hundred ninety-four billion, two hundred eighty-one million, one hundred forty thousand, nine hundred sixty-eight".