51800518068 has 24 divisors (see below), whose sum is σ = 130165404768. Its totient is φ = 15938620896.

The previous prime is 51800518067. The next prime is 51800518103. The reversal of 51800518068 is 86081500815.

It is a happy number.

51800518068 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×51800518068² (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 (51800518067) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166027146 + ... + 166027457.

It is an arithmetic number, because the mean of its divisors is an integer number (5423558532).

Almost surely, 2^51800518068 is an apocalyptic number.

It is an amenable number.

51800518068 is an abundant number, since it is smaller than the sum of its proper divisors (78364886700).

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

51800518068 is a wasteful number, since it uses less digits than its factorization.

51800518068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332054623 (or 332054621 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 42.

The spelling of 51800518068 in words is "fifty-one billion, eight hundred million, five hundred eighteen thousand, sixty-eight".