1165605506 has 12 divisors (see below), whose sum is σ = 1893247362. Its totient is φ = 537971616.

The previous prime is 1165605491. The next prime is 1165605517. The reversal of 1165605506 is 6055065611.

It can be written as a sum of positive squares in 3 ways, for example, as 807071281 + 358534225 = 28409^2 + 18935^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1723931 + ... + 1724606.

Almost surely, 2^1165605506 is an apocalyptic number.

1165605506 is a deficient number, since it is larger than the sum of its proper divisors (727641856).

1165605506 is a wasteful number, since it uses less digits than its factorization.

1165605506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3448565 (or 3448552 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 1165605506 is about 34140.9652177556. The cubic root of 1165605506 is about 1052.4073279159.

The spelling of 1165605506 in words is "one billion, one hundred sixty-five million, six hundred five thousand, five hundred six".