19945616953543 has 2 divisors, whose sum is σ = 19945616953544. Its totient is φ = 19945616953542.

The previous prime is 19945616953499. The next prime is 19945616953547. The reversal of 19945616953543 is 34535961654991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19945616953543 - 2⁴¹ = 17746593697991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19945616953547) 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, 9972808476771 + 9972808476772.

It is an arithmetic number, because the mean of its divisors is an integer number (9972808476772).

Almost surely, 2^{19945616953543} is an apocalyptic number.

19945616953543 is a deficient number, since it is larger than the sum of its proper divisors (1).

19945616953543 is an equidigital number, since it uses as much as digits as its factorization.

19945616953543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 472392000, while the sum is 70.

The spelling of 19945616953543 in words is "nineteen trillion, nine hundred forty-five billion, six hundred sixteen million, nine hundred fifty-three thousand, five hundred forty-three".