641966899200 has 384 divisors, whose sum is σ = 2315811867840. Its totient is φ = 155621785600.

The previous prime is 641966899187. The next prime is 641966899201. The reversal of 641966899200 is 2998669146.

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641966899201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27021727 + ... + 27045473.

Almost surely, 2^641966899200 is an apocalyptic number.

641966899200 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 641966899200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1157905933920).

641966899200 is an abundant number, since it is smaller than the sum of its proper divisors (1673844968640).

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

641966899200 is a wasteful number, since it uses less digits than its factorization.

641966899200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23801 (or 23768 counting only the distinct ones).

The product of its (nonzero) digits is 10077696, while the sum is 60.

The spelling of 641966899200 in words is "six hundred forty-one billion, nine hundred sixty-six million, eight hundred ninety-nine thousand, two hundred".