202144520681 has 6 divisors (see below), whose sum is σ = 213343663482. Its totient is φ = 191505335040.

The previous prime is 202144520671. The next prime is 202144520693. The reversal of 202144520681 is 186025441202.

It can be written as a sum of positive squares in only one way, i.e., 161697277456 + 40447243225 = 402116^2 + 201115^2 .

It is not a de Polignac number, because 202144520681 - 2³⁴ = 184964651497 is a prime.

It is a super-2 number, since 2×202144520681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (202144520671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 279978200 + ... + 279978921.

It is an arithmetic number, because the mean of its divisors is an integer number (35557277247).

Almost surely, 2^202144520681 is an apocalyptic number.

It is an amenable number.

202144520681 is a deficient number, since it is larger than the sum of its proper divisors (11199142801).

202144520681 is an equidigital number, since it uses as much as digits as its factorization.

202144520681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559957159 (or 559957140 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 35.

Adding to 202144520681 its reverse (186025441202), we get a palindrome (388169961883).

The spelling of 202144520681 in words is "two hundred two billion, one hundred forty-four million, five hundred twenty thousand, six hundred eighty-one".