51002815500 has 576 divisors, whose sum is σ = 201478717440. Its totient is φ = 10573632000.

The previous prime is 51002815481. The next prime is 51002815541. The reversal of 51002815500 is 551820015.

51002815500 is a `hidden beast` number, since 5 + 100 + 2 + 8 + 1 + 550 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 24159445 + ... + 24161555.

It is an arithmetic number, because the mean of its divisors is an integer number (349789440).

Almost surely, 2^51002815500 is an apocalyptic number.

51002815500 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 51002815500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100739358720).

51002815500 is an abundant number, since it is smaller than the sum of its proper divisors (150475901940).

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

51002815500 is a wasteful number, since it uses less digits than its factorization.

51002815500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2215 (or 2200 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

The spelling of 51002815500 in words is "fifty-one billion, two million, eight hundred fifteen thousand, five hundred".