6991203138163 has 2 divisors, whose sum is σ = 6991203138164. Its totient is φ = 6991203138162.

The previous prime is 6991203138121. The next prime is 6991203138167. The reversal of 6991203138163 is 3618313021996.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6991203138163 - 2²⁹ = 6990666267251 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6991203138163.

It is not a weakly prime, because it can be changed into another prime (6991203138167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3495601569081 + 3495601569082.

It is an arithmetic number, because the mean of its divisors is an integer number (3495601569082).

Almost surely, 2^{6991203138163} is an apocalyptic number.

6991203138163 is a deficient number, since it is larger than the sum of its proper divisors (1).

6991203138163 is an equidigital number, since it uses as much as digits as its factorization.

6991203138163 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1259712, while the sum is 52.

The spelling of 6991203138163 in words is "six trillion, nine hundred ninety-one billion, two hundred three million, one hundred thirty-eight thousand, one hundred sixty-three".