1181066065 has 4 divisors (see below), whose sum is σ = 1417279284. Its totient is φ = 944852848.

The previous prime is 1181066063. The next prime is 1181066099. The reversal of 1181066065 is 5606601811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5606601811 = 9173 ⋅611207.

It can be written as a sum of positive squares in 2 ways, for example, as 259822161 + 921243904 = 16119^2 + 30352^2 .

It is a cyclic number.

It is not a de Polignac number, because 1181066065 - 2¹ = 1181066063 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1181066065.

It is not an unprimeable number, because it can be changed into a prime (1181066063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118106602 + ... + 118106611.

It is an arithmetic number, because the mean of its divisors is an integer number (354319821).

Almost surely, 2^1181066065 is an apocalyptic number.

It is an amenable number.

1181066065 is a deficient number, since it is larger than the sum of its proper divisors (236213219).

1181066065 is an equidigital number, since it uses as much as digits as its factorization.

1181066065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236213218.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 1181066065 is about 34366.6417474853. The cubic root of 1181066065 is about 1057.0399394530.

Adding to 1181066065 its reverse (5606601811), we get a palindrome (6787667876).

The spelling of 1181066065 in words is "one billion, one hundred eighty-one million, sixty-six thousand, sixty-five".