210798565640 has 64 divisors (see below), whose sum is σ = 511376846400. Its totient is φ = 77742542592.

The previous prime is 210798565543. The next prime is 210798565643. The reversal of 210798565640 is 46565897012.

It is not an unprimeable number, because it can be changed into a prime (210798565643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 210719 + ... + 682641.

It is an arithmetic number, because the mean of its divisors is an integer number (7990263225).

Almost surely, 2^210798565640 is an apocalyptic number.

210798565640 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 210798565640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255688423200).

210798565640 is an abundant number, since it is smaller than the sum of its proper divisors (300578280760).

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

210798565640 is a wasteful number, since it uses less digits than its factorization.

210798565640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472806 (or 472802 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 53.

The spelling of 210798565640 in words is "two hundred ten billion, seven hundred ninety-eight million, five hundred sixty-five thousand, six hundred forty".