165421834200 has 1536 divisors, whose sum is σ = 712335360000. Its totient is φ = 35206617600.

The previous prime is 165421834187. The next prime is 165421834229. The reversal of 165421834200 is 2438124561.

It is a happy number.

165421834200 is a `hidden beast` number, since 1 + 6 + 54 + 2 + 183 + 420 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 2468982567 + ... + 2468982633.

It is an arithmetic number, because the mean of its divisors is an integer number (463760000).

Almost surely, 2^165421834200 is an apocalyptic number.

165421834200 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 165421834200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (356167680000).

165421834200 is an abundant number, since it is smaller than the sum of its proper divisors (546913525800).

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

165421834200 is a wasteful number, since it uses less digits than its factorization.

165421834200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187 (or 158 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

Adding to 165421834200 its reverse (2438124561), we get a palindrome (167859958761).

The spelling of 165421834200 in words is "one hundred sixty-five billion, four hundred twenty-one million, eight hundred thirty-four thousand, two hundred".