51206750068656 has 320 divisors, whose sum is σ = 169094315048960. Its totient is φ = 12989243151360.

The previous prime is 51206750068601. The next prime is 51206750068673. The reversal of 51206750068656 is 65686005760215.

It is a junction number, because it is equal to n+sod(n) for n = 51206750068596 and 51206750068605.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 20911485 + ... + 23231523.

It is an arithmetic number, because the mean of its divisors is an integer number (528419734528).

Almost surely, 2^{51206750068656} is an apocalyptic number.

51206750068656 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51206750068656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84547157524480).

51206750068656 is an abundant number, since it is smaller than the sum of its proper divisors (117887564980304).

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

51206750068656 is a wasteful number, since it uses less digits than its factorization.

51206750068656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2320264 (or 2320258 counting only the distinct ones).

The product of its (nonzero) digits is 18144000, while the sum is 57.

The spelling of 51206750068656 in words is "fifty-one trillion, two hundred six billion, seven hundred fifty million, sixty-eight thousand, six hundred fifty-six".