51291433369728 has 96 divisors (see below), whose sum is σ = 147830353257600. Its totient is φ = 17070048898560.

The previous prime is 51291433369723. The next prime is 51291433369733. The reversal of 51291433369728 is 82796333419215.

51291433369728 is a `hidden beast` number, since 5 + 1 + 2 + 91 + 433 + 3 + 6 + 97 + 28 = 666.

It is an interprime number because it is at equal distance from previous prime (51291433369723) and next prime (51291433369733).

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×51291433369728² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51291433369723) 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 11 ways as a sum of consecutive naturals, for example, 34553448 + ... + 36007271.

It is an arithmetic number, because the mean of its divisors is an integer number (1539899513100).

Almost surely, 2^{51291433369728} is an apocalyptic number.

It is an amenable number.

51291433369728 is an abundant number, since it is smaller than the sum of its proper divisors (96538919887872).

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

51291433369728 is a wasteful number, since it uses less digits than its factorization.

51291433369728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70561370 (or 70561355 counting only the distinct ones).

The product of its digits is 58786560, while the sum is 63.

The spelling of 51291433369728 in words is "fifty-one trillion, two hundred ninety-one billion, four hundred thirty-three million, three hundred sixty-nine thousand, seven hundred twenty-eight".