51061013640 has 384 divisors, whose sum is σ = 204949704960. Its totient is φ = 10736105472.

The previous prime is 51061013621. The next prime is 51061013669. The reversal of 51061013640 is 4631016015.

51061013640 is a `hidden beast` number, since 5 + 1 + 0 + 6 + 1 + 0 + 13 + 640 = 666.

It is a super-2 number, since 2×51061013640² (a number of 22 digits) contains 22 as substring.

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 95 ways as a sum of consecutive naturals, for example, 10054782 + ... + 10059858.

It is an arithmetic number, because the mean of its divisors is an integer number (533723190).

Almost surely, 2^51061013640 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 51061013640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102474852480).

51061013640 is an abundant number, since it is smaller than the sum of its proper divisors (153888691320).

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

51061013640 is a wasteful number, since it uses less digits than its factorization.

51061013640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5421 (or 5414 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

Adding to 51061013640 its reverse (4631016015), we get a palindrome (55692029655).

The spelling of 51061013640 in words is "fifty-one billion, sixty-one million, thirteen thousand, six hundred forty".