201895381565 has 4 divisors (see below), whose sum is σ = 242274457884. Its totient is φ = 161516305248.

The previous prime is 201895381553. The next prime is 201895381579. The reversal of 201895381565 is 565183598102.

201895381565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 123823756996 + 78071624569 = 351886^2 + 279413^2 .

It is a cyclic number.

It is not a de Polignac number, because 201895381565 - 2⁸ = 201895381309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 20189538152 + ... + 20189538161.

It is an arithmetic number, because the mean of its divisors is an integer number (60568614471).

Almost surely, 2^201895381565 is an apocalyptic number.

It is an amenable number.

201895381565 is a deficient number, since it is larger than the sum of its proper divisors (40379076319).

201895381565 is an equidigital number, since it uses as much as digits as its factorization.

201895381565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40379076318.

The product of its (nonzero) digits is 2592000, while the sum is 53.

The spelling of 201895381565 in words is "two hundred one billion, eight hundred ninety-five million, three hundred eighty-one thousand, five hundred sixty-five".