51705448656 has 20 divisors (see below), whose sum is σ = 133572409152. Its totient is φ = 17235149536.

The previous prime is 51705448649. The next prime is 51705448673. The reversal of 51705448656 is 65684450715.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 51705448599 and 51705448608.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 538598376 + ... + 538598471.

Almost surely, 2^51705448656 is an apocalyptic number.

It is an amenable number.

51705448656 is an abundant number, since it is smaller than the sum of its proper divisors (81866960496).

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

51705448656 is a wasteful number, since it uses less digits than its factorization.

51705448656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1077196858 (or 1077196852 counting only the distinct ones).

The product of its (nonzero) digits is 4032000, while the sum is 51.

The spelling of 51705448656 in words is "fifty-one billion, seven hundred five million, four hundred forty-eight thousand, six hundred fifty-six".