51656516111 has 2 divisors, whose sum is σ = 51656516112. Its totient is φ = 51656516110.

The previous prime is 51656516071. The next prime is 51656516137. The reversal of 51656516111 is 11161565615.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51656516111 - 2¹⁸ = 51656253967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51656516311) 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 as a sum of consecutive naturals, namely, 25828258055 + 25828258056.

It is an arithmetic number, because the mean of its divisors is an integer number (25828258056).

Almost surely, 2^51656516111 is an apocalyptic number.

51656516111 is a deficient number, since it is larger than the sum of its proper divisors (1).

51656516111 is an equidigital number, since it uses as much as digits as its factorization.

51656516111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27000, while the sum is 38.

The spelling of 51656516111 in words is "fifty-one billion, six hundred fifty-six million, five hundred sixteen thousand, one hundred eleven".