51857812500 has 432 divisors, whose sum is σ = 174562410624. Its totient is φ = 11880000000.

The previous prime is 51857812481. The next prime is 51857812613. The reversal of 51857812500 is 521875815.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 1401562482 + ... + 1401562518.

Almost surely, 2^51857812500 is an apocalyptic number.

51857812500 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 51857812500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87281205312).

51857812500 is an abundant number, since it is smaller than the sum of its proper divisors (122704598124).

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

51857812500 is an equidigital number, since it uses as much as digits as its factorization.

51857812500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120 (or 83 counting only the distinct ones).

The product of its (nonzero) digits is 112000, while the sum is 42.

The spelling of 51857812500 in words is "fifty-one billion, eight hundred fifty-seven million, eight hundred twelve thousand, five hundred".