201866738538 has 8 divisors (see below), whose sum is σ = 403733477088. Its totient is φ = 67288912844.

The previous prime is 201866738533. The next prime is 201866738539. The reversal of 201866738538 is 835837668102.

201866738538 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

201866738538 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (201866738533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16822228206 + ... + 16822228217.

It is an arithmetic number, because the mean of its divisors is an integer number (50466684636).

Almost surely, 2^201866738538 is an apocalyptic number.

201866738538 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

201866738538 is a wasteful number, since it uses less digits than its factorization.

201866738538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33644456428.

The product of its (nonzero) digits is 11612160, while the sum is 57.

The spelling of 201866738538 in words is "two hundred one billion, eight hundred sixty-six million, seven hundred thirty-eight thousand, five hundred thirty-eight".