51681054218436 has 72 divisors (see below), whose sum is σ = 131164606145664. Its totient is φ = 17157647551680.

The previous prime is 51681054218419. The next prime is 51681054218447. The reversal of 51681054218436 is 63481245018615.

51681054218436 is a `hidden beast` number, since 5 + 1 + 6 + 8 + 10 + 542 + 1 + 84 + 3 + 6 = 666.

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, 28013110 + ... + 29800946.

It is an arithmetic number, because the mean of its divisors is an integer number (1821730640912).

Almost surely, 2^{51681054218436} is an apocalyptic number.

It is an amenable number.

51681054218436 is an abundant number, since it is smaller than the sum of its proper divisors (79483551927228).

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

51681054218436 is a wasteful number, since it uses less digits than its factorization.

51681054218436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1791081 (or 1791076 counting only the distinct ones).

The product of its (nonzero) digits is 5529600, while the sum is 54.

The spelling of 51681054218436 in words is "fifty-one trillion, six hundred eighty-one billion, fifty-four million, two hundred eighteen thousand, four hundred thirty-six".