51005555556 has 24 divisors (see below), whose sum is σ = 125276803680. Its totient is φ = 16107017472.

The previous prime is 51005555551. The next prime is 51005555567. The reversal of 51005555556 is 65555550015.

It is not an unprimeable number, because it can be changed into a prime (51005555551) 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, 111854061 + ... + 111854516.

It is an arithmetic number, because the mean of its divisors is an integer number (5219866820).

Almost surely, 2^51005555556 is an apocalyptic number.

It is an amenable number.

51005555556 is an abundant number, since it is smaller than the sum of its proper divisors (74271248124).

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

51005555556 is a wasteful number, since it uses less digits than its factorization.

51005555556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223708603 (or 223708601 counting only the distinct ones).

The product of its (nonzero) digits is 468750, while the sum is 42.

The spelling of 51005555556 in words is "fifty-one billion, five million, five hundred fifty-five thousand, five hundred fifty-six".