201323605644 has 36 divisors (see below), whose sum is σ = 581601528144. Its totient is φ = 57521030112.

The previous prime is 201323605601. The next prime is 201323605649. The reversal of 201323605644 is 446506323102.

201323605644 is a `hidden beast` number, since 2 + 0 + 1 + 3 + 2 + 3 + 6 + 0 + 5 + 644 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a junction number, because it is equal to n+sod(n) for n = 201323605599 and 201323605608.

It is not an unprimeable number, because it can be changed into a prime (201323605649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 399451347 + ... + 399451850.

It is an arithmetic number, because the mean of its divisors is an integer number (16155598004).

Almost surely, 2^201323605644 is an apocalyptic number.

It is an amenable number.

201323605644 is an abundant number, since it is smaller than the sum of its proper divisors (380277922500).

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

201323605644 is a wasteful number, since it uses less digits than its factorization.

201323605644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798903214 (or 798903209 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

Adding to 201323605644 its reverse (446506323102), we get a palindrome (647829928746).

The spelling of 201323605644 in words is "two hundred one billion, three hundred twenty-three million, six hundred five thousand, six hundred forty-four".