1165026555 has 48 divisors (see below), whose sum is σ = 2517675264. Its totient is φ = 484165440.

The previous prime is 1165026529. The next prime is 1165026557. The reversal of 1165026555 is 5556205611.

It is not a de Polignac number, because 1165026555 - 2⁵ = 1165026523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1165026557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 164649 + ... + 171578.

It is an arithmetic number, because the mean of its divisors is an integer number (52451568).

Almost surely, 2^1165026555 is an apocalyptic number.

1165026555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1165026555 is an abundant number, since it is smaller than the sum of its proper divisors (1352648709).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1165026555 is a wasteful number, since it uses less digits than its factorization.

1165026555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336256 (or 336253 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 36.

The square root of 1165026555 is about 34132.4853328907. The cubic root of 1165026555 is about 1052.2330570677.

The spelling of 1165026555 in words is "one billion, one hundred sixty-five million, twenty-six thousand, five hundred fifty-five".