51315445444 has 24 divisors (see below), whose sum is σ = 89919462528. Its totient is φ = 25624199040.

The previous prime is 51315445397. The next prime is 51315445459. The reversal of 51315445444 is 44454451315.

It is a super-2 number, since 2×51315445444² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51315445397 and 51315445406.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 18927249 + ... + 18929959.

It is an arithmetic number, because the mean of its divisors is an integer number (3746644272).

Almost surely, 2^51315445444 is an apocalyptic number.

It is an amenable number.

51315445444 is a deficient number, since it is larger than the sum of its proper divisors (38604017084).

51315445444 is a wasteful number, since it uses less digits than its factorization.

51315445444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7155 (or 7153 counting only the distinct ones).

The product of its digits is 384000, while the sum is 40.

Adding to 51315445444 its reverse (44454451315), we get a palindrome (95769896759).

The spelling of 51315445444 in words is "fifty-one billion, three hundred fifteen million, four hundred forty-five thousand, four hundred forty-four".