51111055111 has 2 divisors, whose sum is σ = 51111055112. Its totient is φ = 51111055110.

The previous prime is 51111055109. The next prime is 51111055217. The reversal of 51111055111 is 11155011115.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51111055111 - 2¹ = 51111055109 is a prime.

It is a super-2 number, since 2×51111055111² (a number of 22 digits) contains 22 as substring.

Together with 51111055109, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51111055511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25555527555 + 25555527556.

It is an arithmetic number, because the mean of its divisors is an integer number (25555527556).

Almost surely, 2^51111055111 is an apocalyptic number.

51111055111 is a deficient number, since it is larger than the sum of its proper divisors (1).

51111055111 is an equidigital number, since it uses as much as digits as its factorization.

51111055111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 125, while the sum is 22.

Adding to 51111055111 its reverse (11155011115), we get a palindrome (62266066226).

The spelling of 51111055111 in words is "fifty-one billion, one hundred eleven million, fifty-five thousand, one hundred eleven".