51208836063840 has 2688 divisors, whose sum is σ = 232191014372352. Its totient is φ = 10379220664320.

The previous prime is 51208836063793. The next prime is 51208836063863. The reversal of 51208836063840 is 4836063880215.

51208836063840 is a `hidden beast` number, since 5 + 1 + 20 + 8 + 8 + 3 + 606 + 3 + 8 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 447 ways as a sum of consecutive naturals, for example, 32596330255 + ... + 32596331825.

It is an arithmetic number, because the mean of its divisors is an integer number (86380585704).

Almost surely, 2^{51208836063840} 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 51208836063840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116095507186176).

51208836063840 is an abundant number, since it is smaller than the sum of its proper divisors (180982178308512).

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

51208836063840 is a wasteful number, since it uses less digits than its factorization.

51208836063840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1744 (or 1721 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 54.

The spelling of 51208836063840 in words is "fifty-one trillion, two hundred eight billion, eight hundred thirty-six million, sixty-three thousand, eight hundred forty".