2161733724209 has 2 divisors, whose sum is σ = 2161733724210. Its totient is φ = 2161733724208.

The previous prime is 2161733724091. The next prime is 2161733724247. The reversal of 2161733724209 is 9024273371612.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1598403918400 + 563329805809 = 1264280^2 + 750553^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2161733724209 is a prime.

It is not a weakly prime, because it can be changed into another prime (2161733724299) 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 as a sum of consecutive naturals, namely, 1080866862104 + 1080866862105.

It is an arithmetic number, because the mean of its divisors is an integer number (1080866862105).

Almost surely, 2^{2161733724209} is an apocalyptic number.

It is an amenable number.

2161733724209 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161733724209 is an equidigital number, since it uses as much as digits as its factorization.

2161733724209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 762048, while the sum is 47.

The spelling of 2161733724209 in words is "two trillion, one hundred sixty-one billion, seven hundred thirty-three million, seven hundred twenty-four thousand, two hundred nine".