2168305621723 has 2 divisors, whose sum is σ = 2168305621724. Its totient is φ = 2168305621722.

The previous prime is 2168305621697. The next prime is 2168305621813. The reversal of 2168305621723 is 3271265038612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2168305621723 - 2¹³ = 2168305613531 is a prime.

It is not a weakly prime, because it can be changed into another prime (2168305625723) 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, 1084152810861 + 1084152810862.

It is an arithmetic number, because the mean of its divisors is an integer number (1084152810862).

Almost surely, 2^{2168305621723} is an apocalyptic number.

2168305621723 is a deficient number, since it is larger than the sum of its proper divisors (1).

2168305621723 is an equidigital number, since it uses as much as digits as its factorization.

2168305621723 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 725760, while the sum is 46.

The spelling of 2168305621723 in words is "two trillion, one hundred sixty-eight billion, three hundred five million, six hundred twenty-one thousand, seven hundred twenty-three".