201533500861 has 16 divisors (see below), whose sum is σ = 256390358400. Its totient is φ = 157039088640.

The previous prime is 201533500853. The next prime is 201533500877. The reversal of 201533500861 is 168005335102.

It is not a de Polignac number, because 201533500861 - 2³ = 201533500853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201533500361) 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 15 ways as a sum of consecutive naturals, for example, 26703556 + ... + 26711101.

It is an arithmetic number, because the mean of its divisors is an integer number (16024397400).

Almost surely, 2^201533500861 is an apocalyptic number.

It is an amenable number.

201533500861 is a deficient number, since it is larger than the sum of its proper divisors (54856857539).

201533500861 is an equidigital number, since it uses as much as digits as its factorization.

201533500861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53414689 (or 53414675 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

Adding to 201533500861 its reverse (168005335102), we get a palindrome (369538835963).

The spelling of 201533500861 in words is "two hundred one billion, five hundred thirty-three million, five hundred thousand, eight hundred sixty-one".