51665111 has 2 divisors, whose sum is σ = 51665112. Its totient is φ = 51665110.

The previous prime is 51665101. The next prime is 51665113. The reversal of 51665111 is 11156615.

51665111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51665111 - 2¹⁰ = 51664087 is a prime.

Together with 51665113, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51665113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25832555 + 25832556.

It is an arithmetic number, because the mean of its divisors is an integer number (25832556).

Almost surely, 2^51665111 is an apocalyptic number.

51665111 is a deficient number, since it is larger than the sum of its proper divisors (1).

51665111 is an equidigital number, since it uses as much as digits as its factorization.

51665111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 900, while the sum is 26.

The square root of 51665111 is about 7187.8446699967. The cubic root of 51665111 is about 372.4481221389.

The spelling of 51665111 in words is "fifty-one million, six hundred sixty-five thousand, one hundred eleven".