19945616953499 has 2 divisors, whose sum is σ = 19945616953500. Its totient is φ = 19945616953498.

The previous prime is 19945616953487. The next prime is 19945616953543. The reversal of 19945616953499 is 99435961654991.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19945616953499 is a prime.

It is not a weakly prime, because it can be changed into another prime (19945616653499) 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, 9972808476749 + 9972808476750.

It is an arithmetic number, because the mean of its divisors is an integer number (9972808476750).

Almost surely, 2^{19945616953499} is an apocalyptic number.

19945616953499 is a deficient number, since it is larger than the sum of its proper divisors (1).

19945616953499 is an equidigital number, since it uses as much as digits as its factorization.

19945616953499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2550916800, while the sum is 80.

The spelling of 19945616953499 in words is "nineteen trillion, nine hundred forty-five billion, six hundred sixteen million, nine hundred fifty-three thousand, four hundred ninety-nine".