641949646848 has 120 divisors (see below), whose sum is σ = 1712796624000. Its totient is φ = 213860352000.

The previous prime is 641949646841. The next prime is 641949646873. The reversal of 641949646848 is 848646949146.

It is not an unprimeable number, because it can be changed into a prime (641949646841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135116473 + ... + 135121223.

It is an arithmetic number, because the mean of its divisors is an integer number (14273305200).

Almost surely, 2^641949646848 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 641949646848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (856398312000).

641949646848 is an abundant number, since it is smaller than the sum of its proper divisors (1070846977152).

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

641949646848 is an equidigital number, since it uses as much as digits as its factorization.

641949646848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7531 (or 7505 counting only the distinct ones).

The product of its digits is 286654464, while the sum is 69.

The spelling of 641949646848 in words is "six hundred forty-one billion, nine hundred forty-nine million, six hundred forty-six thousand, eight hundred forty-eight".