165005800 has 24 divisors (see below), whose sum is σ = 383638950. Its totient is φ = 66002240.

The previous prime is 165005783. The next prime is 165005803. The reversal of 165005800 is 8500561.

It can be written as a sum of positive squares in 3 ways, for example, as 67272804 + 97732996 = 8202^2 + 9886^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (165005803) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 412315 + ... + 412714.

Almost surely, 2^165005800 is an apocalyptic number.

165005800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165005800 is an abundant number, since it is smaller than the sum of its proper divisors (218633150).

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

165005800 is a wasteful number, since it uses less digits than its factorization.

165005800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825045 (or 825036 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 165005800 is about 12845.4583413750. The cubic root of 165005800 is about 548.4870818100.

The spelling of 165005800 in words is "one hundred sixty-five million, five thousand, eight hundred".