51216203808 has 288 divisors, whose sum is σ = 185452001280. Its totient is φ = 13019604480.

The previous prime is 51216203747. The next prime is 51216203813. The reversal of 51216203808 is 80830261215.

It is a happy number.

51216203808 is a `hidden beast` number, since 5 + 1 + 21 + 620 + 3 + 8 + 0 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1017703 + ... + 1066841.

It is an arithmetic number, because the mean of its divisors is an integer number (643930560).

Almost surely, 2^51216203808 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 51216203808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92726000640).

51216203808 is an abundant number, since it is smaller than the sum of its proper divisors (134235797472).

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

51216203808 is a wasteful number, since it uses less digits than its factorization.

51216203808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49220 (or 49209 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The spelling of 51216203808 in words is "fifty-one billion, two hundred sixteen million, two hundred three thousand, eight hundred eight".