1165641265 has 8 divisors (see below), whose sum is σ = 1459585728. Its totient is φ = 891968880.

The previous prime is 1165641263. The next prime is 1165641271. The reversal of 1165641265 is 5621465611.

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

It is not a de Polignac number, because 1165641265 - 2¹ = 1165641263 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1165641263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5067891 + ... + 5068120.

It is an arithmetic number, because the mean of its divisors is an integer number (182448216).

Almost surely, 2^1165641265 is an apocalyptic number.

It is an amenable number.

1165641265 is a deficient number, since it is larger than the sum of its proper divisors (293944463).

1165641265 is a wasteful number, since it uses less digits than its factorization.

1165641265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10136039.

The product of its digits is 43200, while the sum is 37.

The square root of 1165641265 is about 34141.4889101222. The cubic root of 1165641265 is about 1052.4180898900.

The spelling of 1165641265 in words is "one billion, one hundred sixty-five million, six hundred forty-one thousand, two hundred sixty-five".