9665551111 has 2 divisors, whose sum is σ = 9665551112. Its totient is φ = 9665551110.

The previous prime is 9665551043. The next prime is 9665551151. The reversal of 9665551111 is 1111555669.

It is an a-pointer prime, because the next prime (9665551151) can be obtained adding 9665551111 to its sum of digits (40).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9665551111 - 2²³ = 9657162503 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9665551151) 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, 4832775555 + 4832775556.

It is an arithmetic number, because the mean of its divisors is an integer number (4832775556).

Almost surely, 2^9665551111 is an apocalyptic number.

9665551111 is a deficient number, since it is larger than the sum of its proper divisors (1).

9665551111 is an equidigital number, since it uses as much as digits as its factorization.

9665551111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40500, while the sum is 40.

The square root of 9665551111 is about 98313.5347294562. The cubic root of 9665551111 is about 2130.1435619989.

The spelling of 9665551111 in words is "nine billion, six hundred sixty-five million, five hundred fifty-one thousand, one hundred eleven".