165601331200 has 144 divisors (see below), whose sum is σ = 411137279280. Its totient is φ = 66152448000.

The previous prime is 165601331197. The next prime is 165601331221. The reversal of 165601331200 is 2133106561.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49713535 + ... + 49716865.

It is an arithmetic number, because the mean of its divisors is an integer number (2855119995).

Almost surely, 2^165601331200 is an apocalyptic number.

165601331200 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 165601331200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (205568639640).

165601331200 is an abundant number, since it is smaller than the sum of its proper divisors (245535948080).

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

165601331200 is an equidigital number, since it uses as much as digits as its factorization.

165601331200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4334 (or 4309 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

Adding to 165601331200 its reverse (2133106561), we get a palindrome (167734437761).

The spelling of 165601331200 in words is "one hundred sixty-five billion, six hundred one million, three hundred thirty-one thousand, two hundred".