51721968188352 has 112 divisors (see below), whose sum is σ = 170615323683072. Its totient is φ = 13434277447680.

The previous prime is 51721968188327. The next prime is 51721968188353. The reversal of 51721968188352 is 25388186912715.

51721968188352 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51721968188353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1749240093 + ... + 1749269660.

Almost surely, 2^{51721968188352} is an apocalyptic number.

It is an amenable number.

51721968188352 is an abundant number, since it is smaller than the sum of its proper divisors (118893355494720).

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

51721968188352 is a wasteful number, since it uses less digits than its factorization.

51721968188352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3498509786 (or 3498509776 counting only the distinct ones).

The product of its digits is 58060800, while the sum is 66.

The spelling of 51721968188352 in words is "fifty-one trillion, seven hundred twenty-one billion, nine hundred sixty-eight million, one hundred eighty-eight thousand, three hundred fifty-two".