165421355200 has 168 divisors, whose sum is σ = 421112984544. Its totient is φ = 63912960000.

The previous prime is 165421355189. The next prime is 165421355207. The reversal of 165421355200 is 2553124561.

It is not an unprimeable number, because it can be changed into a prime (165421355207) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6613117 + ... + 6638083.

It is an arithmetic number, because the mean of its divisors is an integer number (2506624908).

Almost surely, 2^165421355200 is an apocalyptic number.

165421355200 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 165421355200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (210556492272).

165421355200 is an abundant number, since it is smaller than the sum of its proper divisors (255691629344).

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

165421355200 is a wasteful number, since it uses less digits than its factorization.

165421355200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25131 (or 25116 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 34.

Adding to 165421355200 its reverse (2553124561), we get a palindrome (167974479761).

The spelling of 165421355200 in words is "one hundred sixty-five billion, four hundred twenty-one million, three hundred fifty-five thousand, two hundred".