19456543397 has 2 divisors, whose sum is σ = 19456543398. Its totient is φ = 19456543396.

The previous prime is 19456543391. The next prime is 19456543409. The reversal of 19456543397 is 79334565491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14755932676 + 4700610721 = 121474^2 + 68561^2 .

It is a cyclic number.

It is not a de Polignac number, because 19456543397 - 2¹⁰ = 19456542373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19456543391) 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, 9728271698 + 9728271699.

It is an arithmetic number, because the mean of its divisors is an integer number (9728271699).

Almost surely, 2^19456543397 is an apocalyptic number.

It is an amenable number.

19456543397 is a deficient number, since it is larger than the sum of its proper divisors (1).

19456543397 is an equidigital number, since it uses as much as digits as its factorization.

19456543397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12247200, while the sum is 56.

The spelling of 19456543397 in words is "nineteen billion, four hundred fifty-six million, five hundred forty-three thousand, three hundred ninety-seven".