1166445641 has 2 divisors, whose sum is σ = 1166445642. Its totient is φ = 1166445640.

The previous prime is 1166445607. The next prime is 1166445691. The reversal of 1166445641 is 1465446611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 653876041 + 512569600 = 25571^2 + 22640^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1166445641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1166445595 and 1166445604.

It is not a weakly prime, because it can be changed into another prime (1166445691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 583222820 + 583222821.

It is an arithmetic number, because the mean of its divisors is an integer number (583222821).

Almost surely, 2^1166445641 is an apocalyptic number.

It is an amenable number.

1166445641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1166445641 is an equidigital number, since it uses as much as digits as its factorization.

1166445641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 38.

The square root of 1166445641 is about 34153.2669154797. The cubic root of 1166445641 is about 1052.6601155255.

The spelling of 1166445641 in words is "one billion, one hundred sixty-six million, four hundred forty-five thousand, six hundred forty-one".