51233223136512 has 144 divisors (see below), whose sum is σ = 137267626591872. Its totient is φ = 16963520471040.

The previous prime is 51233223136481. The next prime is 51233223136549. The reversal of 51233223136512 is 21563132233215.

It is a super-2 number, since 2×51233223136512² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 384691438 + ... + 384824594.

It is an arithmetic number, because the mean of its divisors is an integer number (953247406888).

Almost surely, 2^{51233223136512} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51233223136512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68633813295936).

51233223136512 is an abundant number, since it is smaller than the sum of its proper divisors (86034403455360).

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

51233223136512 is a wasteful number, since it uses less digits than its factorization.

51233223136512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136524 (or 136510 counting only the distinct ones).

The product of its digits is 194400, while the sum is 39.

Adding to 51233223136512 its reverse (21563132233215), we get a palindrome (72796355369727).

The spelling of 51233223136512 in words is "fifty-one trillion, two hundred thirty-three billion, two hundred twenty-three million, one hundred thirty-six thousand, five hundred twelve".