51512243112 has 256 divisors, whose sum is σ = 163344384000. Its totient is φ = 14888966400.

The previous prime is 51512243039. The next prime is 51512243143. The reversal of 51512243112 is 21134221515.

It is a happy number.

51512243112 is a `hidden beast` number, since 515 + 12 + 24 + 3 + 112 = 666.

It is a super-2 number, since 2×51512243112² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 23005689 + ... + 23007927.

It is an arithmetic number, because the mean of its divisors is an integer number (638064000).

Almost surely, 2^51512243112 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 51512243112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81672192000).

51512243112 is an abundant number, since it is smaller than the sum of its proper divisors (111832140888).

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

51512243112 is a wasteful number, since it uses less digits than its factorization.

51512243112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2709 (or 2699 counting only the distinct ones).

The product of its digits is 2400, while the sum is 27.

Adding to 51512243112 its reverse (21134221515), we get a palindrome (72646464627).

The spelling of 51512243112 in words is "fifty-one billion, five hundred twelve million, two hundred forty-three thousand, one hundred twelve".