2164313533661 has 2 divisors, whose sum is σ = 2164313533662. Its totient is φ = 2164313533660.

The previous prime is 2164313533643. The next prime is 2164313533691. The reversal of 2164313533661 is 1663353134612.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1665003122500 + 499310411161 = 1290350^2 + 706619^2 .

It is a cyclic number.

It is not a de Polignac number, because 2164313533661 - 2²⁶ = 2164246424797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2164313533621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1082156766830 + 1082156766831.

It is an arithmetic number, because the mean of its divisors is an integer number (1082156766831).

Almost surely, 2^{2164313533661} is an apocalyptic number.

It is an amenable number.

2164313533661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2164313533661 is an equidigital number, since it uses as much as digits as its factorization.

2164313533661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 699840, while the sum is 44.

The spelling of 2164313533661 in words is "two trillion, one hundred sixty-four billion, three hundred thirteen million, five hundred thirty-three thousand, six hundred sixty-one".