51289204805 has 6 divisors (see below), whose sum is σ = 61547653458. Its totient is φ = 41030958720.

The previous prime is 51289204783. The next prime is 51289204817. The reversal of 51289204805 is 50840298215.

It can be written as a sum of positive squares in 3 ways, for example, as 5253640324 + 46035564481 = 72482^2 + 214559^2 .

It is not a de Polignac number, because 51289204805 - 2⁶ = 51289204741 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 455765 + ... + 557045.

It is an arithmetic number, because the mean of its divisors is an integer number (10257942243).

Almost surely, 2^51289204805 is an apocalyptic number.

It is an amenable number.

51289204805 is a deficient number, since it is larger than the sum of its proper divisors (10258448653).

51289204805 is an frugal number, since it uses more digits than its factorization.

51289204805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202567 (or 101286 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 44.

The spelling of 51289204805 in words is "fifty-one billion, two hundred eighty-nine million, two hundred four thousand, eight hundred five".