1155665617 has 2 divisors, whose sum is σ = 1155665618. Its totient is φ = 1155665616.

The previous prime is 1155665597. The next prime is 1155665639. The reversal of 1155665617 is 7165665511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 810597841 + 345067776 = 28471^2 + 18576^2 .

It is an emirp because it is prime and its reverse (7165665511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1155665617 - 2¹⁹ = 1155141329 is a prime.

It is not a weakly prime, because it can be changed into another prime (1155665677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577832808 + 577832809.

It is an arithmetic number, because the mean of its divisors is an integer number (577832809).

Almost surely, 2^1155665617 is an apocalyptic number.

It is an amenable number.

1155665617 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155665617 is an equidigital number, since it uses as much as digits as its factorization.

1155665617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 189000, while the sum is 43.

The square root of 1155665617 is about 33995.0822472898. The cubic root of 1155665617 is about 1049.4072594052.

The spelling of 1155665617 in words is "one billion, one hundred fifty-five million, six hundred sixty-five thousand, six hundred seventeen".