51905404812 has 12 divisors (see below), whose sum is σ = 121112611256. Its totient is φ = 17301801600.

The previous prime is 51905404777. The next prime is 51905404843. The reversal of 51905404812 is 21840450915.

It is a tau number, because it is divible by the number of its divisors (12).

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 3 ways as a sum of consecutive naturals, for example, 2162725189 + ... + 2162725212.

Almost surely, 2^51905404812 is an apocalyptic number.

It is an amenable number.

51905404812 is an abundant number, since it is smaller than the sum of its proper divisors (69207206444).

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

51905404812 is a wasteful number, since it uses less digits than its factorization.

51905404812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4325450408 (or 4325450406 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 39.

The spelling of 51905404812 in words is "fifty-one billion, nine hundred five million, four hundred four thousand, eight hundred twelve".