2185390458709 has 2 divisors, whose sum is σ = 2185390458710. Its totient is φ = 2185390458708.

The previous prime is 2185390458697. The next prime is 2185390458731. The reversal of 2185390458709 is 9078540935812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1862004889809 + 323385568900 = 1364553^2 + 568670^2 .

It is a cyclic number.

It is not a de Polignac number, because 2185390458709 - 2¹³ = 2185390450517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2185390458739) 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, 1092695229354 + 1092695229355.

It is an arithmetic number, because the mean of its divisors is an integer number (1092695229355).

Almost surely, 2^{2185390458709} is an apocalyptic number.

It is an amenable number.

2185390458709 is a deficient number, since it is larger than the sum of its proper divisors (1).

2185390458709 is an equidigital number, since it uses as much as digits as its factorization.

2185390458709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21772800, while the sum is 61.

The spelling of 2185390458709 in words is "two trillion, one hundred eighty-five billion, three hundred ninety million, four hundred fifty-eight thousand, seven hundred nine".