51656134111 has 16 divisors (see below), whose sum is σ = 52196773888. Its totient is φ = 51119229600.

The previous prime is 51656134109. The next prime is 51656134129. The reversal of 51656134111 is 11143165615.

It is a cyclic number.

It is not a de Polignac number, because 51656134111 - 2¹ = 51656134109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51656134811) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 41758585 + ... + 41759821.

It is an arithmetic number, because the mean of its divisors is an integer number (3262298368).

Almost surely, 2^51656134111 is an apocalyptic number.

51656134111 is a deficient number, since it is larger than the sum of its proper divisors (540639777).

51656134111 is a wasteful number, since it uses less digits than its factorization.

51656134111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2422.

The product of its digits is 10800, while the sum is 34.

Adding to 51656134111 its reverse (11143165615), we get a palindrome (62799299726).

The spelling of 51656134111 in words is "fifty-one billion, six hundred fifty-six million, one hundred thirty-four thousand, one hundred eleven".