201609238236 has 192 divisors, whose sum is σ = 551156272128. Its totient is φ = 56173658112.

The previous prime is 201609238231. The next prime is 201609238253. The reversal of 201609238236 is 632832906102.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201609238231) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 339981556 + ... + 339982148.

It is an arithmetic number, because the mean of its divisors is an integer number (2870605584).

Almost surely, 2^201609238236 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201609238236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (275578136064).

201609238236 is an abundant number, since it is smaller than the sum of its proper divisors (349547033892).

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

201609238236 is a wasteful number, since it uses less digits than its factorization.

201609238236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1180 (or 1178 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 42.

The spelling of 201609238236 in words is "two hundred one billion, six hundred nine million, two hundred thirty-eight thousand, two hundred thirty-six".