1165053561 has 16 divisors (see below), whose sum is σ = 1776153600. Its totient is φ = 665432208.

The previous prime is 1165053467. The next prime is 1165053577. The reversal of 1165053561 is 1653505611.

It is not a de Polignac number, because 1165053561 - 2⁷ = 1165053433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1165053161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37260 + ... + 60978.

It is an arithmetic number, because the mean of its divisors is an integer number (111009600).

Almost surely, 2^1165053561 is an apocalyptic number.

It is an amenable number.

1165053561 is a deficient number, since it is larger than the sum of its proper divisors (611100039).

1165053561 is a wasteful number, since it uses less digits than its factorization.

1165053561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26068.

The product of its (nonzero) digits is 13500, while the sum is 33.

The square root of 1165053561 is about 34132.8809361296. The cubic root of 1165053561 is about 1052.2411874651.

The spelling of 1165053561 in words is "one billion, one hundred sixty-five million, fifty-three thousand, five hundred sixty-one".