51656510111 has 2 divisors, whose sum is σ = 51656510112. Its totient is φ = 51656510110.

The previous prime is 51656510107. The next prime is 51656510137. The reversal of 51656510111 is 11101565615.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51656510111 - 2² = 51656510107 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51656510141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25828255055 + 25828255056.

It is an arithmetic number, because the mean of its divisors is an integer number (25828255056).

Almost surely, 2^51656510111 is an apocalyptic number.

51656510111 is a deficient number, since it is larger than the sum of its proper divisors (1).

51656510111 is an equidigital number, since it uses as much as digits as its factorization.

51656510111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4500, while the sum is 32.

The spelling of 51656510111 in words is "fifty-one billion, six hundred fifty-six million, five hundred ten thousand, one hundred eleven".