51721216520764 has 36 divisors (see below), whose sum is σ = 105291761360184. Its totient is φ = 22165784701536.

The previous prime is 51721216520761. The next prime is 51721216520807. The reversal of 51721216520764 is 46702561212715.

51721216520764 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×51721216520764³ (a number of 42 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51721216520761) 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 11 ways as a sum of consecutive naturals, for example, 7064727 + ... + 12383569.

It is an arithmetic number, because the mean of its divisors is an integer number (2924771148894).

Almost surely, 2^{51721216520764} is an apocalyptic number.

It is an amenable number.

51721216520764 is an abundant number, since it is smaller than the sum of its proper divisors (53570544839420).

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

51721216520764 is a wasteful number, since it uses less digits than its factorization.

51721216520764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5368474 (or 5368465 counting only the distinct ones).

The product of its (nonzero) digits is 1411200, while the sum is 49.

The spelling of 51721216520764 in words is "fifty-one trillion, seven hundred twenty-one billion, two hundred sixteen million, five hundred twenty thousand, seven hundred sixty-four".