1165551565 has 32 divisors (see below), whose sum is σ = 1484904960. Its totient is φ = 876496896.

The previous prime is 1165551521. The next prime is 1165551587. The reversal of 1165551565 is 5651555611.

It is a cyclic number.

It is not a de Polignac number, because 1165551565 - 2⁹ = 1165551053 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2691589 + ... + 2692021.

It is an arithmetic number, because the mean of its divisors is an integer number (46403280).

Almost surely, 2^1165551565 is an apocalyptic number.

It is an amenable number.

1165551565 is a deficient number, since it is larger than the sum of its proper divisors (319353395).

1165551565 is a wasteful number, since it uses less digits than its factorization.

1165551565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 813.

The product of its digits is 112500, while the sum is 40.

The square root of 1165551565 is about 34140.1752338795. The cubic root of 1165551565 is about 1052.3910934983.

The spelling of 1165551565 in words is "one billion, one hundred sixty-five million, five hundred fifty-one thousand, five hundred sixty-five".