201201323440 has 80 divisors (see below), whose sum is σ = 504253850688. Its totient is φ = 74219424768.

The previous prime is 201201323417. The next prime is 201201323483. The reversal of 201201323440 is 44323102102.

It is a tau number, because it is divible by the number of its divisors (80).

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 15 ways as a sum of consecutive naturals, for example, 1014522 + ... + 1196518.

Almost surely, 2^201201323440 is an apocalyptic number.

201201323440 is a gapful number since it is divisible by the number (20) 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 201201323440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (252126925344).

201201323440 is an abundant number, since it is smaller than the sum of its proper divisors (303052527248).

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

201201323440 is a wasteful number, since it uses less digits than its factorization.

201201323440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183086 (or 183080 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 201201323440 its reverse (44323102102), we get a palindrome (245524425542).

The spelling of 201201323440 in words is "two hundred one billion, two hundred one million, three hundred twenty-three thousand, four hundred forty".