51656015205 has 12 divisors (see below), whose sum is σ = 89537093100. Its totient is φ = 27549874752.

The previous prime is 51656015189. The next prime is 51656015221. The reversal of 51656015205 is 50251065615.

It is an interprime number because it is at equal distance from previous prime (51656015189) and next prime (51656015221).

It can be written as a sum of positive squares in 2 ways, for example, as 12654900036 + 39001115169 = 112494^2 + 197487^2 .

It is not a de Polignac number, because 51656015205 - 2⁴ = 51656015189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51656015205.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 573955680 + ... + 573955769.

It is an arithmetic number, because the mean of its divisors is an integer number (7461424425).

Almost surely, 2^51656015205 is an apocalyptic number.

It is an amenable number.

51656015205 is a deficient number, since it is larger than the sum of its proper divisors (37881077895).

51656015205 is a wasteful number, since it uses less digits than its factorization.

51656015205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1147911460 (or 1147911457 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 36.

The spelling of 51656015205 in words is "fifty-one billion, six hundred fifty-six million, fifteen thousand, two hundred five".