1165506500 has 48 divisors (see below), whose sum is σ = 2552252976. Its totient is φ = 464960000.

The previous prime is 1165506487. The next prime is 1165506509. The reversal of 1165506500 is 56055611.

It can be written as a sum of positive squares in 8 ways, for example, as 30625156 + 1134881344 = 5534^2 + 33688^2 .

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1165506509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197594 + ... + 203406.

It is an arithmetic number, because the mean of its divisors is an integer number (53171937).

Almost surely, 2^1165506500 is an apocalyptic number.

1165506500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1165506500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1276126488).

1165506500 is an abundant number, since it is smaller than the sum of its proper divisors (1386746476).

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

1165506500 is a wasteful number, since it uses less digits than its factorization.

1165506500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6233 (or 6221 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 1165506500 is about 34139.5152279583. The cubic root of 1165506500 is about 1052.3775300727.

The spelling of 1165506500 in words is "one billion, one hundred sixty-five million, five hundred six thousand, five hundred".