1643016229909 has 2 divisors, whose sum is σ = 1643016229910. Its totient is φ = 1643016229908.

The previous prime is 1643016229871. The next prime is 1643016229937. The reversal of 1643016229909 is 9099226103461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1428945298225 + 214070931684 = 1195385^2 + 462678^2 .

It is a cyclic number.

It is not a de Polignac number, because 1643016229909 - 2¹¹ = 1643016227861 is a prime.

It is a super-2 number, since 2×1643016229909² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1643016229009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821508114954 + 821508114955.

It is an arithmetic number, because the mean of its divisors is an integer number (821508114955).

Almost surely, 2^{1643016229909} is an apocalyptic number.

It is an amenable number.

1643016229909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1643016229909 is an equidigital number, since it uses as much as digits as its factorization.

1643016229909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1259712, while the sum is 52.

The spelling of 1643016229909 in words is "one trillion, six hundred forty-three billion, sixteen million, two hundred twenty-nine thousand, nine hundred nine".