1166565947 has 2 divisors, whose sum is σ = 1166565948. Its totient is φ = 1166565946.

The previous prime is 1166565901. The next prime is 1166566021. The reversal of 1166565947 is 7495656611.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1166565947 - 2²⁶ = 1099457083 is a prime.

It is a super-2 number, since 2×1166565947² = 2721752217400013618, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1166565895 and 1166565904.

It is not a weakly prime, because it can be changed into another prime (1166564947) 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, 583282973 + 583282974.

It is an arithmetic number, because the mean of its divisors is an integer number (583282974).

Almost surely, 2^1166565947 is an apocalyptic number.

1166565947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1166565947 is an equidigital number, since it uses as much as digits as its factorization.

1166565947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1360800, while the sum is 50.

The square root of 1166565947 is about 34155.0281364252. The cubic root of 1166565947 is about 1052.6963043741.

The spelling of 1166565947 in words is "one billion, one hundred sixty-six million, five hundred sixty-five thousand, nine hundred forty-seven".