51721428254481 has 12 divisors (see below), whose sum is σ = 74709218363520. Its totient is φ = 34480726633080.

The previous prime is 51721428254459. The next prime is 51721428254527. The reversal of 51721428254481 is 18445282412715.

51721428254481 is a `hidden beast` number, since 5 + 1 + 7 + 2 + 14 + 2 + 8 + 2 + 544 + 81 = 666.

It is not a de Polignac number, because 51721428254481 - 2⁵ = 51721428254449 is a prime.

It is a super-2 number, since 2×51721428254481² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51721428254401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17336361 + ... + 20099558.

It is an arithmetic number, because the mean of its divisors is an integer number (6225768196960).

Almost surely, 2^{51721428254481} is an apocalyptic number.

It is an amenable number.

51721428254481 is a deficient number, since it is larger than the sum of its proper divisors (22987790109039).

51721428254481 is a wasteful number, since it uses less digits than its factorization.

51721428254481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37589436 (or 37589433 counting only the distinct ones).

The product of its digits is 5734400, while the sum is 54.

The spelling of 51721428254481 in words is "fifty-one trillion, seven hundred twenty-one billion, four hundred twenty-eight million, two hundred fifty-four thousand, four hundred eighty-one".