51055040000 has 200 divisors, whose sum is σ = 128792835600. Its totient is φ = 20210688000.

The previous prime is 51055039961. The next prime is 51055040021. The reversal of 51055040000 is 4055015.

It is a tau number, because it is divible by the number of its divisors (200).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 32959226 + ... + 32960774.

It is an arithmetic number, because the mean of its divisors is an integer number (643964178).

Almost surely, 2^51055040000 is an apocalyptic number.

51055040000 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 51055040000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64396417800).

51055040000 is an abundant number, since it is smaller than the sum of its proper divisors (77737795600).

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

51055040000 is an equidigital number, since it uses as much as digits as its factorization.

51055040000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1690 (or 1659 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 20.

Adding to 51055040000 its reverse (4055015), we get a palindrome (51059095015).

The spelling of 51055040000 in words is "fifty-one billion, fifty-five million, forty thousand".