201243401065 has 32 divisors (see below), whose sum is σ = 290708121600. Its totient is φ = 133543972800.

The previous prime is 201243401063. The next prime is 201243401071. The reversal of 201243401065 is 560104342102.

It is not a de Polignac number, because 201243401065 - 2¹ = 201243401063 is a prime.

It is not an unprimeable number, because it can be changed into a prime (201243401063) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1839466 + ... + 1945795.

It is an arithmetic number, because the mean of its divisors is an integer number (9084628800).

Almost surely, 2^201243401065 is an apocalyptic number.

It is an amenable number.

201243401065 is a deficient number, since it is larger than the sum of its proper divisors (89464720535).

201243401065 is an equidigital number, since it uses as much as digits as its factorization.

201243401065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3785318 (or 3785304 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 201243401065 its reverse (560104342102), we get a palindrome (761347743167).

The spelling of 201243401065 in words is "two hundred one billion, two hundred forty-three million, four hundred one thousand, sixty-five".