51215045200 has 120 divisors (see below), whose sum is σ = 135462713760. Its totient is φ = 18452620800.

The previous prime is 51215045191. The next prime is 51215045221. The reversal of 51215045200 is 254051215.

51215045200 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 426207 + ... + 532993.

It is an arithmetic number, because the mean of its divisors is an integer number (1128855948).

Almost surely, 2^51215045200 is an apocalyptic number.

51215045200 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 51215045200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67731356880).

51215045200 is an abundant number, since it is smaller than the sum of its proper divisors (84247668560).

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

51215045200 is a wasteful number, since it uses less digits than its factorization.

51215045200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106925 (or 106914 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

Adding to 51215045200 its reverse (254051215), we get a palindrome (51469096415).

The spelling of 51215045200 in words is "fifty-one billion, two hundred fifteen million, forty-five thousand, two hundred".