1165263155 has 8 divisors (see below), whose sum is σ = 1598075232. Its totient is φ = 799037568.

The previous prime is 1165263139. The next prime is 1165263223. The reversal of 1165263155 is 5513625611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1165263155 - 2⁴ = 1165263139 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35), and also a Moran number because the ratio is a prime number: 33293233 = 1165263155 / (1 + 1 + 6 + 5 + 2 + 6 + 3 + 1 + 5 + 5).

It is a Duffinian number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 16646582 + ... + 16646651.

It is an arithmetic number, because the mean of its divisors is an integer number (199759404).

Almost surely, 2^1165263155 is an apocalyptic number.

1165263155 is a deficient number, since it is larger than the sum of its proper divisors (432812077).

1165263155 is an equidigital number, since it uses as much as digits as its factorization.

1165263155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33293245.

The product of its digits is 27000, while the sum is 35.

The square root of 1165263155 is about 34135.9510633584. The cubic root of 1165263155 is about 1052.3042833383.

Adding to 1165263155 its reverse (5513625611), we get a palindrome (6678888766).

The spelling of 1165263155 in words is "one billion, one hundred sixty-five million, two hundred sixty-three thousand, one hundred fifty-five".