51235850808 has 80 divisors (see below), whose sum is σ = 143761068000. Its totient is φ = 17048479104.

The previous prime is 51235850807. The next prime is 51235850837. The reversal of 51235850808 is 80805853215.

51235850808 is a `hidden beast` number, since 512 + 3 + 5 + 8 + 50 + 80 + 8 = 666.

It is a super-2 number, since 2×51235850808² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51235850807) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 299233 + ... + 438191.

It is an arithmetic number, because the mean of its divisors is an integer number (1797013350).

Almost surely, 2^51235850808 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 51235850808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71880534000).

51235850808 is an abundant number, since it is smaller than the sum of its proper divisors (92525217192).

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

51235850808 is a wasteful number, since it uses less digits than its factorization.

51235850808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139546 (or 139533 counting only the distinct ones).

The product of its (nonzero) digits is 384000, while the sum is 45.

The spelling of 51235850808 in words is "fifty-one billion, two hundred thirty-five million, eight hundred fifty thousand, eight hundred eight".