9661111111 has 2 divisors, whose sum is σ = 9661111112. Its totient is φ = 9661111110.

The previous prime is 9661111099. The next prime is 9661111139. The reversal of 9661111111 is 1111111669.

It is an a-pointer prime, because the next prime (9661111139) can be obtained adding 9661111111 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9661111111 - 2¹¹ = 9661109063 is a prime.

9661111111 is a modest number, since divided by 111111 gives 9661 as remainder.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 9661111111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9661111151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4830555555 + 4830555556.

It is an arithmetic number, because the mean of its divisors is an integer number (4830555556).

Almost surely, 2^9661111111 is an apocalyptic number.

9661111111 is a deficient number, since it is larger than the sum of its proper divisors (1).

9661111111 is an equidigital number, since it uses as much as digits as its factorization.

9661111111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324, while the sum is 28.

The square root of 9661111111 is about 98290.9513180130. The cubic root of 9661111111 is about 2129.8173420772.

The spelling of 9661111111 in words is "nine billion, six hundred sixty-one million, one hundred eleven thousand, one hundred eleven".