1643249522669 has 2 divisors, whose sum is σ = 1643249522670. Its totient is φ = 1643249522668.

The previous prime is 1643249522617. The next prime is 1643249522701. The reversal of 1643249522669 is 9662259423461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 832178168644 + 811071354025 = 912238^2 + 900595^2 .

It is a cyclic number.

It is not a de Polignac number, because 1643249522669 - 2²⁰ = 1643248474093 is a prime.

It is a super-2 number, since 2×1643249522669² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1643249524669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821624761334 + 821624761335.

It is an arithmetic number, because the mean of its divisors is an integer number (821624761335).

Almost surely, 2^{1643249522669} is an apocalyptic number.

It is an amenable number.

1643249522669 is a deficient number, since it is larger than the sum of its proper divisors (1).

1643249522669 is an equidigital number, since it uses as much as digits as its factorization.

1643249522669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 33592320, while the sum is 59.

The spelling of 1643249522669 in words is "one trillion, six hundred forty-three billion, two hundred forty-nine million, five hundred twenty-two thousand, six hundred sixty-nine".