19931503216697 has 2 divisors, whose sum is σ = 19931503216698. Its totient is φ = 19931503216696.

The previous prime is 19931503216637. The next prime is 19931503216733. The reversal of 19931503216697 is 79661230513991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19126793749561 + 804709467136 = 4373419^2 + 897056^2 .

It is a cyclic number.

It is not a de Polignac number, because 19931503216697 - 2⁴² = 15533456705593 is a prime.

It is not a weakly prime, because it can be changed into another prime (19931503216627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9965751608348 + 9965751608349.

It is an arithmetic number, because the mean of its divisors is an integer number (9965751608349).

Almost surely, 2^{19931503216697} is an apocalyptic number.

It is an amenable number.

19931503216697 is a deficient number, since it is larger than the sum of its proper divisors (1).

19931503216697 is an equidigital number, since it uses as much as digits as its factorization.

19931503216697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16533720, while the sum is 62.

The spelling of 19931503216697 in words is "nineteen trillion, nine hundred thirty-one billion, five hundred three million, two hundred sixteen thousand, six hundred ninety-seven".