1165655159 has 4 divisors (see below), whose sum is σ = 1169803680. Its totient is φ = 1161506640.

The previous prime is 1165655083. The next prime is 1165655171. The reversal of 1165655159 is 9515565611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9515565611 = 1721 ⋅5529091.

It is a cyclic number.

It is not a de Polignac number, because 1165655159 - 2²⁸ = 897219703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1165655759) 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 3 ways as a sum of consecutive naturals, for example, 2073839 + ... + 2074400.

It is an arithmetic number, because the mean of its divisors is an integer number (292450920).

Almost surely, 2^1165655159 is an apocalyptic number.

1165655159 is a deficient number, since it is larger than the sum of its proper divisors (4148521).

1165655159 is an equidigital number, since it uses as much as digits as its factorization.

1165655159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4148520.

The product of its digits is 202500, while the sum is 44.

The square root of 1165655159 is about 34141.6923862892. The cubic root of 1165655159 is about 1052.4222713476.

The spelling of 1165655159 in words is "one billion, one hundred sixty-five million, six hundred fifty-five thousand, one hundred fifty-nine".