1166110661 has 2 divisors, whose sum is σ = 1166110662. Its totient is φ = 1166110660.

The previous prime is 1166110657. The next prime is 1166110697. The reversal of 1166110661 is 1660116611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 753777025 + 412333636 = 27455^2 + 20306^2 .

It is a cyclic number.

It is not a de Polignac number, because 1166110661 - 2² = 1166110657 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1166110061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 583055330 + 583055331.

It is an arithmetic number, because the mean of its divisors is an integer number (583055331).

Almost surely, 2^1166110661 is an apocalyptic number.

It is an amenable number.

1166110661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1166110661 is an equidigital number, since it uses as much as digits as its factorization.

1166110661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 1166110661 is about 34148.3624936834. The cubic root of 1166110661 is about 1052.5593381914.

It can be divided in two parts, 11661 and 10661, that added together give a palindrome (22322).

The spelling of 1166110661 in words is "one billion, one hundred sixty-six million, one hundred ten thousand, six hundred sixty-one".