2164640343757 has 2 divisors, whose sum is σ = 2164640343758. Its totient is φ = 2164640343756.

The previous prime is 2164640343743. The next prime is 2164640343763. The reversal of 2164640343757 is 7573430464612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1687572472356 + 477067871401 = 1299066^2 + 690701^2 .

It is a cyclic number.

It is not a de Polignac number, because 2164640343757 - 2³¹ = 2162492860109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2164640343157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1082320171878 + 1082320171879.

It is an arithmetic number, because the mean of its divisors is an integer number (1082320171879).

Almost surely, 2^{2164640343757} is an apocalyptic number.

It is an amenable number.

2164640343757 is a deficient number, since it is larger than the sum of its proper divisors (1).

2164640343757 is an equidigital number, since it uses as much as digits as its factorization.

2164640343757 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10160640, while the sum is 52.

The spelling of 2164640343757 in words is "two trillion, one hundred sixty-four billion, six hundred forty million, three hundred forty-three thousand, seven hundred fifty-seven".