51208018218 has 24 divisors (see below), whose sum is σ = 126800807328. Its totient is φ = 14630862312.

The previous prime is 51208018159. The next prime is 51208018237. The reversal of 51208018218 is 81281080215.

It is a super-2 number, since 2×51208018218² (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 11 ways as a sum of consecutive naturals, for example, 203206296 + ... + 203206547.

It is an arithmetic number, because the mean of its divisors is an integer number (5283366972).

Almost surely, 2^51208018218 is an apocalyptic number.

51208018218 is an abundant number, since it is smaller than the sum of its proper divisors (75592789110).

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

51208018218 is a wasteful number, since it uses less digits than its factorization.

51208018218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406412858 (or 406412855 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 36.

The spelling of 51208018218 in words is "fifty-one billion, two hundred eight million, eighteen thousand, two hundred eighteen".