1165665013 has 4 divisors (see below), whose sum is σ = 1165978060. Its totient is φ = 1165351968.

The previous prime is 1165664989. The next prime is 1165665019. The reversal of 1165665013 is 3105665611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3105665611 = 61 ⋅50912551.

It can be written as a sum of positive squares in 2 ways, for example, as 550277764 + 615387249 = 23458^2 + 24807^2 .

It is a cyclic number.

It is not a de Polignac number, because 1165665013 - 2⁹ = 1165664501 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 1165665013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165665019) by changing a digit.

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, 150870 + ... + 158407.

It is an arithmetic number, because the mean of its divisors is an integer number (291494515).

Almost surely, 2^1165665013 is an apocalyptic number.

It is an amenable number.

1165665013 is a deficient number, since it is larger than the sum of its proper divisors (313047).

1165665013 is an equidigital number, since it uses as much as digits as its factorization.

1165665013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313046.

The product of its (nonzero) digits is 16200, while the sum is 34.

The square root of 1165665013 is about 34141.8366963466. The cubic root of 1165665013 is about 1052.4252369302.

The spelling of 1165665013 in words is "one billion, one hundred sixty-five million, six hundred sixty-five thousand, thirteen".