51680747556 has 27 divisors (see below), whose sum is σ = 130640893201. Its totient is φ = 17226461184.

The previous prime is 51680747549. The next prime is 51680747617. The reversal of 51680747556 is 65574708615.

It is a happy number.

The square root of 51680747556 is 227334.

It is a perfect power (a square), and thus also a powerful number.

51680747556 is a `hidden beast` number, since 5 + 1 + 6 + 80 + 7 + 4 + 7 + 556 = 666.

It can be written as a sum of positive squares in only one way, i.e., 11520587556 + 40160160000 = 107334^2 + 200400^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1345060 + ... + 1382948.

Almost surely, 2^51680747556 is an apocalyptic number.

51680747556 is the 227334-th square number.

It is an amenable number.

51680747556 is an abundant number, since it is smaller than the sum of its proper divisors (78960145645).

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

51680747556 is an frugal number, since it uses more digits than its factorization.

51680747556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75788 (or 37894 counting only the distinct ones).

The product of its (nonzero) digits is 7056000, while the sum is 54.

It can be divided in two parts, 51680 and 747556, that added together give a square (799236 = 894²).

The spelling of 51680747556 in words is "fifty-one billion, six hundred eighty million, seven hundred forty-seven thousand, five hundred fifty-six".