1163655665 has 16 divisors (see below), whose sum is σ = 1491827520. Its totient is φ = 868760640.

The previous prime is 1163655659. The next prime is 1163655667. The reversal of 1163655665 is 5665563611.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-1163655665 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1163655667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85046 + ... + 97775.

It is an arithmetic number, because the mean of its divisors is an integer number (93239220).

Almost surely, 2^1163655665 is an apocalyptic number.

It is an amenable number.

1163655665 is a deficient number, since it is larger than the sum of its proper divisors (328171855).

1163655665 is a wasteful number, since it uses less digits than its factorization.

1163655665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182912.

The product of its digits is 486000, while the sum is 44.

The square root of 1163655665 is about 34112.3975264126. The cubic root of 1163655665 is about 1051.8201732195.

The spelling of 1163655665 in words is "one billion, one hundred sixty-three million, six hundred fifty-five thousand, six hundred sixty-five".