51660012 has 48 divisors (see below), whose sum is σ = 130995200. Its totient is φ = 15785280.

The previous prime is 51659989. The next prime is 51660017. The reversal of 51660012 is 21006615.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (51660017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3414 + ... + 10722.

Almost surely, 2^51660012 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 51660012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65497600).

51660012 is an abundant number, since it is smaller than the sum of its proper divisors (79335188).

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

51660012 is a wasteful number, since it uses less digits than its factorization.

51660012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7366 (or 7364 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 51660012 is about 7187.4899652104. The cubic root of 51660012 is about 372.4358690251.

Adding to 51660012 its reverse (21006615), we get a palindrome (72666627).

The spelling of 51660012 in words is "fifty-one million, six hundred sixty thousand, twelve".