561838938500 has 192 divisors, whose sum is σ = 1453286016000. Its totient is φ = 185657472000.

The previous prime is 561838938497. The next prime is 561838938511. The reversal of 561838938500 is 5839838165.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 60793880 + ... + 60803120.

It is an arithmetic number, because the mean of its divisors is an integer number (7569198000).

Almost surely, 2^561838938500 is an apocalyptic number.

561838938500 is a gapful number since it is divisible by the number (50) 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 561838938500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (726643008000).

561838938500 is an abundant number, since it is smaller than the sum of its proper divisors (891447077500).

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

561838938500 is a wasteful number, since it uses less digits than its factorization.

561838938500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9895 (or 9883 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 56.

The spelling of 561838938500 in words is "five hundred sixty-one billion, eight hundred thirty-eight million, nine hundred thirty-eight thousand, five hundred".