2133543661 has 2 divisors, whose sum is σ = 2133543662. Its totient is φ = 2133543660.

The previous prime is 2133543647. The next prime is 2133543677. The reversal of 2133543661 is 1663453312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2052633636 + 80910025 = 45306^2 + 8995^2 .

It is a cyclic number.

It is not a de Polignac number, because 2133543661 - 2¹⁹ = 2133019373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2133513661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1066771830 + 1066771831.

It is an arithmetic number, because the mean of its divisors is an integer number (1066771831).

Almost surely, 2^2133543661 is an apocalyptic number.

It is an amenable number.

2133543661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2133543661 is an equidigital number, since it uses as much as digits as its factorization.

2133543661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 34.

The square root of 2133543661 is about 46190.2983428339. The cubic root of 2133543661 is about 1287.3614841526.

Adding to 2133543661 its reverse (1663453312), we get a palindrome (3796996973).

The spelling of 2133543661 in words is "two billion, one hundred thirty-three million, five hundred forty-three thousand, six hundred sixty-one".