1165253565 has 96 divisors (see below), whose sum is σ = 2300538240. Its totient is φ = 500774400.

The previous prime is 1165253549. The next prime is 1165253591. The reversal of 1165253565 is 5653525611.

It is not a de Polignac number, because 1165253565 - 2⁴ = 1165253549 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2527435 + ... + 2527895.

It is an arithmetic number, because the mean of its divisors is an integer number (23963940).

Almost surely, 2^1165253565 is an apocalyptic number.

1165253565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1165253565 is a deficient number, since it is larger than the sum of its proper divisors (1135284675).

1165253565 is a wasteful number, since it uses less digits than its factorization.

1165253565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683 (or 676 counting only the distinct ones).

The product of its digits is 135000, while the sum is 39.

The square root of 1165253565 is about 34135.8105953264. The cubic root of 1165253565 is about 1052.3013965438.

The spelling of 1165253565 in words is "one billion, one hundred sixty-five million, two hundred fifty-three thousand, five hundred sixty-five".