19999146468397 has 2 divisors, whose sum is σ = 19999146468398. Its totient is φ = 19999146468396.

The previous prime is 19999146468391. The next prime is 19999146468407. The reversal of 19999146468397 is 79386464199991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15742079881641 + 4257066586756 = 3967629^2 + 2063266^2 .

It is a cyclic number.

It is not a de Polignac number, because 19999146468397 - 2¹⁹ = 19999145944109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19999146468391) 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, 9999573234198 + 9999573234199.

It is an arithmetic number, because the mean of its divisors is an integer number (9999573234199).

Almost surely, 2^{19999146468397} is an apocalyptic number.

It is an amenable number.

19999146468397 is a deficient number, since it is larger than the sum of its proper divisors (1).

19999146468397 is an equidigital number, since it uses as much as digits as its factorization.

19999146468397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5714053632, while the sum is 85.

The spelling of 19999146468397 in words is "nineteen trillion, nine hundred ninety-nine billion, one hundred forty-six million, four hundred sixty-eight thousand, three hundred ninety-seven".