51321111544 has 8 divisors (see below), whose sum is σ = 96227084160. Its totient is φ = 25660555768.

The previous prime is 51321111539. The next prime is 51321111563. The reversal of 51321111544 is 44511112315.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×51321111544² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3207569464 + ... + 3207569479.

It is an arithmetic number, because the mean of its divisors is an integer number (12028385520).

Almost surely, 2^51321111544 is an apocalyptic number.

It is an amenable number.

51321111544 is a deficient number, since it is larger than the sum of its proper divisors (44905972616).

51321111544 is a wasteful number, since it uses less digits than its factorization.

51321111544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6415138949 (or 6415138945 counting only the distinct ones).

The product of its digits is 2400, while the sum is 28.

Adding to 51321111544 its reverse (44511112315), we get a palindrome (95832223859).

The spelling of 51321111544 in words is "fifty-one billion, three hundred twenty-one million, one hundred eleven thousand, five hundred forty-four".