51728948662689 has 16 divisors (see below), whose sum is σ = 76663076111040. Its totient is φ = 34473547300320.

The previous prime is 51728948662631. The next prime is 51728948662709. The reversal of 51728948662689 is 98626684982715.

51728948662689 is a `hidden beast` number, since 5 + 1 + 72 + 8 + 9 + 486 + 6 + 2 + 68 + 9 = 666.

It is not a de Polignac number, because 51728948662689 - 2⁷ = 51728948662561 is a prime.

It is a super-2 number, since 2×51728948662689² (a number of 28 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (81) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (51723948662689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 344881267 + ... + 345031224.

It is an arithmetic number, because the mean of its divisors is an integer number (4791442256940).

Almost surely, 2^{51728948662689} is an apocalyptic number.

It is an amenable number.

51728948662689 is a deficient number, since it is larger than the sum of its proper divisors (24934127448351).

51728948662689 is a wasteful number, since it uses less digits than its factorization.

51728948662689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689915277 (or 689915271 counting only the distinct ones).

The product of its digits is 5016453120, while the sum is 81.

The spelling of 51728948662689 in words is "fifty-one trillion, seven hundred twenty-eight billion, nine hundred forty-eight million, six hundred sixty-two thousand, six hundred eighty-nine".