51800794500 has 384 divisors, whose sum is σ = 186684825600. Its totient is φ = 10868774400.

The previous prime is 51800794499. The next prime is 51800794517. The reversal of 51800794500 is 549700815.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 27162547 + ... + 27164453.

It is an arithmetic number, because the mean of its divisors is an integer number (486158400).

Almost surely, 2^51800794500 is an apocalyptic number.

51800794500 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 51800794500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93342412800).

51800794500 is an abundant number, since it is smaller than the sum of its proper divisors (134884031100).

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

51800794500 is a wasteful number, since it uses less digits than its factorization.

51800794500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2148 (or 2136 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 39.

The spelling of 51800794500 in words is "fifty-one billion, eight hundred million, seven hundred ninety-four thousand, five hundred".