51664380804 has 81 divisors (see below), whose sum is σ = 133855758309. Its totient is φ = 16801868160.

The previous prime is 51664380793. The next prime is 51664380811. The reversal of 51664380804 is 40808346615.

The square root of 51664380804 is 227298.

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

51664380804 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 9063420804 + 42600960000 = 95202^2 + 206400^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 51664380804.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 58642444 + ... + 58643324.

Almost surely, 2^51664380804 is an apocalyptic number.

51664380804 is the 227298-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51664380804

51664380804 is an abundant number, since it is smaller than the sum of its proper divisors (82191377505).

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

51664380804 is an equidigital number, since it uses as much as digits as its factorization.

51664380804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1858 (or 929 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 45.

The spelling of 51664380804 in words is "fifty-one billion, six hundred sixty-four million, three hundred eighty thousand, eight hundred four".