51216204480 has 224 divisors, whose sum is σ = 185979303936. Its totient is φ = 11697893376.

The previous prime is 51216204469. The next prime is 51216204511. The reversal of 51216204480 is 8440261215.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (224).

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 31 ways as a sum of consecutive naturals, for example, 15030937 + ... + 15034343.

Almost surely, 2^51216204480 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51216204480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92989651968).

51216204480 is an abundant number, since it is smaller than the sum of its proper divisors (134763099456).

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

51216204480 is a wasteful number, since it uses less digits than its factorization.

51216204480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5671 (or 5661 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 33.

Adding to 51216204480 its reverse (8440261215), we get a palindrome (59656465695).

The spelling of 51216204480 in words is "fifty-one billion, two hundred sixteen million, two hundred four thousand, four hundred eighty".