165543652400 has 120 divisors (see below), whose sum is σ = 454828445664. Its totient is φ = 56721254400.

The previous prime is 165543652361. The next prime is 165543652411. The reversal of 165543652400 is 4256345561.

It is a happy number.

165543652400 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4520564 + ... + 4557036.

Almost surely, 2^165543652400 is an apocalyptic number.

165543652400 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 165543652400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (227414222832).

165543652400 is an abundant number, since it is smaller than the sum of its proper divisors (289284793264).

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

165543652400 is a wasteful number, since it uses less digits than its factorization.

165543652400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38119 (or 38108 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 41.

Adding to 165543652400 its reverse (4256345561), we get a palindrome (169799997961).

The spelling of 165543652400 in words is "one hundred sixty-five billion, five hundred forty-three million, six hundred fifty-two thousand, four hundred".