51425064818 has 8 divisors (see below), whose sum is σ = 77206658412. Its totient is φ = 25689512016.

The previous prime is 51425064799. The next prime is 51425064833. The reversal of 51425064818 is 81846052415.

It can be written as a sum of positive squares in 2 ways, for example, as 47740939009 + 3684125809 = 218497^2 + 60697^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11507405 + ... + 11511872.

Almost surely, 2^51425064818 is an apocalyptic number.

51425064818 is a deficient number, since it is larger than the sum of its proper divisors (25781593594).

51425064818 is a wasteful number, since it uses less digits than its factorization.

51425064818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23020396.

The product of its (nonzero) digits is 307200, while the sum is 44.

The spelling of 51425064818 in words is "fifty-one billion, four hundred twenty-five million, sixty-four thousand, eight hundred eighteen".