51215552202400 has 144 divisors (see below), whose sum is σ = 126063476921088. Its totient is φ = 20317322880000.

The previous prime is 51215552202319. The next prime is 51215552202421. The reversal of 51215552202400 is 420225551215.

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, 73704585 + ... + 74396215.

It is an arithmetic number, because the mean of its divisors is an integer number (875440811952).

Almost surely, 2^{51215552202400} is an apocalyptic number.

51215552202400 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 51215552202400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63031738460544).

51215552202400 is an abundant number, since it is smaller than the sum of its proper divisors (74847924718688).

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

51215552202400 is a wasteful number, since it uses less digits than its factorization.

51215552202400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692415 (or 692402 counting only the distinct ones).

The product of its (nonzero) digits is 40000, while the sum is 34.

Adding to 51215552202400 its reverse (420225551215), we get a palindrome (51635777753615).

The spelling of 51215552202400 in words is "fifty-one trillion, two hundred fifteen billion, five hundred fifty-two million, two hundred two thousand, four hundred".