51918882816 has 192 divisors, whose sum is σ = 143972337600. Its totient is φ = 16618291200.

The previous prime is 51918882803. The next prime is 51918882817. The reversal of 51918882816 is 61828881915.

It is a tau number, because it is divible by the number of its divisors (192).

It is not an unprimeable number, because it can be changed into a prime (51918882817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37594446 + ... + 37595826.

It is an arithmetic number, because the mean of its divisors is an integer number (749855925).

Almost surely, 2^51918882816 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 51918882816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71986168800).

51918882816 is an abundant number, since it is smaller than the sum of its proper divisors (92053454784).

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

51918882816 is a wasteful number, since it uses less digits than its factorization.

51918882816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1646 (or 1626 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 57.

Subtracting 51918882816 from its reverse (61828881915), we obtain a palindrome (9909999099).

The spelling of 51918882816 in words is "fifty-one billion, nine hundred eighteen million, eight hundred eighty-two thousand, eight hundred sixteen".