208065811885680 has 640 divisors, whose sum is σ = 783317203347456. Its totient is φ = 44599630233600.

The previous prime is 208065811885667. The next prime is 208065811885681. The reversal of 208065811885680 is 86588118560802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208065811885681) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 9121281475 + ... + 9121304285.

Almost surely, 2^{208065811885680} is an apocalyptic number.

208065811885680 is a gapful number since it is divisible by the number (20) 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 208065811885680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (391658601673728).

208065811885680 is an abundant number, since it is smaller than the sum of its proper divisors (575251391461776).

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

208065811885680 is a wasteful number, since it uses less digits than its factorization.

208065811885680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23985 (or 23979 counting only the distinct ones).

The product of its (nonzero) digits is 58982400, while the sum is 66.

The spelling of 208065811885680 in words is "two hundred eight trillion, sixty-five billion, eight hundred eleven million, eight hundred eighty-five thousand, six hundred eighty".