51216222261216 has 48 divisors (see below), whose sum is σ = 134827805826000. Its totient is φ = 17023156958208.

The previous prime is 51216222261203. The next prime is 51216222261247. The reversal of 51216222261216 is 61216222261215.

51216222261216 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 764296461 + ... + 764363468.

It is an arithmetic number, because the mean of its divisors is an integer number (2808912621375).

Almost surely, 2^{51216222261216} is an apocalyptic number.

It is an amenable number.

51216222261216 is an abundant number, since it is smaller than the sum of its proper divisors (83611583564784).

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

51216222261216 is a wasteful number, since it uses less digits than its factorization.

51216222261216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1528660291 (or 1528660283 counting only the distinct ones).

The product of its digits is 69120, while the sum is 39.

Subtracting 51216222261216 from its reverse (61216222261215), we obtain a palindrome (9999999999999).

The spelling of 51216222261216 in words is "fifty-one trillion, two hundred sixteen billion, two hundred twenty-two million, two hundred sixty-one thousand, two hundred sixteen".