19450137643 has 2 divisors, whose sum is σ = 19450137644. Its totient is φ = 19450137642.

The previous prime is 19450137527. The next prime is 19450137649. The reversal of 19450137643 is 34673105491.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19450137643 - 2⁹ = 19450137131 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19450137643.

It is not a weakly prime, because it can be changed into another prime (19450137649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9725068821 + 9725068822.

It is an arithmetic number, because the mean of its divisors is an integer number (9725068822).

Almost surely, 2^19450137643 is an apocalyptic number.

19450137643 is a deficient number, since it is larger than the sum of its proper divisors (1).

19450137643 is an equidigital number, since it uses as much as digits as its factorization.

19450137643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 43.

The spelling of 19450137643 in words is "nineteen billion, four hundred fifty million, one hundred thirty-seven thousand, six hundred forty-three".