1115666065 has 4 divisors (see below), whose sum is σ = 1338799284. Its totient is φ = 892532848.

The previous prime is 1115666053. The next prime is 1115666077. The reversal of 1115666065 is 5606665111.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1115666053) and next prime (1115666077).

It can be written as a sum of positive squares in 2 ways, for example, as 706655889 + 409010176 = 26583^2 + 20224^2 .

It is a cyclic number.

It is not a de Polignac number, because 1115666065 - 2⁵ = 1115666033 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111566602 + ... + 111566611.

It is an arithmetic number, because the mean of its divisors is an integer number (334699821).

Almost surely, 2^1115666065 is an apocalyptic number.

It is an amenable number.

1115666065 is a deficient number, since it is larger than the sum of its proper divisors (223133219).

1115666065 is an equidigital number, since it uses as much as digits as its factorization.

1115666065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223133218.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 1115666065 is about 33401.5877616619. The cubic root of 1115666065 is about 1037.1575690937.

The spelling of 1115666065 in words is "one billion, one hundred fifteen million, six hundred sixty-six thousand, sixty-five".