1166121611 has 2 divisors, whose sum is σ = 1166121612. Its totient is φ = 1166121610.

The previous prime is 1166121587. The next prime is 1166121701. The reversal of 1166121611 is 1161216611.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1166121611 - 2¹⁰ = 1166120587 is a prime.

It is a super-2 number, since 2×1166121611² = 2719679223282470642, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1166121311) 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, 583060805 + 583060806.

It is an arithmetic number, because the mean of its divisors is an integer number (583060806).

Almost surely, 2^1166121611 is an apocalyptic number.

1166121611 is a deficient number, since it is larger than the sum of its proper divisors (1).

1166121611 is an equidigital number, since it uses as much as digits as its factorization.

1166121611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 26.

The square root of 1166121611 is about 34148.5228231032. The cubic root of 1166121611 is about 1052.5626327583.

The spelling of 1166121611 in words is "one billion, one hundred sixty-six million, one hundred twenty-one thousand, six hundred eleven".