9661111099 has 2 divisors, whose sum is σ = 9661111100. Its totient is φ = 9661111098.

The previous prime is 9661111093. The next prime is 9661111111. The reversal of 9661111099 is 9901111669.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9661111099 - 2⁹ = 9661110587 is a prime.

It is not a weakly prime, because it can be changed into another prime (9661111093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4830555549 + 4830555550.

It is an arithmetic number, because the mean of its divisors is an integer number (4830555550).

Almost surely, 2^9661111099 is an apocalyptic number.

9661111099 is a deficient number, since it is larger than the sum of its proper divisors (1).

9661111099 is an equidigital number, since it uses as much as digits as its factorization.

9661111099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26244, while the sum is 43.

The square root of 9661111099 is about 98290.9512569697. The cubic root of 9661111099 is about 2129.8173411954.

The spelling of 9661111099 in words is "nine billion, six hundred sixty-one million, one hundred eleven thousand, ninety-nine".