1644056355563 has 2 divisors, whose sum is σ = 1644056355564. Its totient is φ = 1644056355562.

The previous prime is 1644056355527. The next prime is 1644056355577. The reversal of 1644056355563 is 3655536504461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1644056355563 - 2⁶ = 1644056355499 is a prime.

It is a super-3 number, since 3×1644056355563³ (a number of 38 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1644056315563) 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, 822028177781 + 822028177782.

It is an arithmetic number, because the mean of its divisors is an integer number (822028177782).

Almost surely, 2^{1644056355563} is an apocalyptic number.

1644056355563 is a deficient number, since it is larger than the sum of its proper divisors (1).

1644056355563 is an equidigital number, since it uses as much as digits as its factorization.

1644056355563 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440000, while the sum is 53.

The spelling of 1644056355563 in words is "one trillion, six hundred forty-four billion, fifty-six million, three hundred fifty-five thousand, five hundred sixty-three".