19391997603 has 18 divisors (see below), whose sum is σ = 28424116812. Its totient is φ = 11751117840.

The previous prime is 19391997601. The next prime is 19391997649. The reversal of 19391997603 is 30679919391.

It is not a de Polignac number, because 19391997603 - 2¹ = 19391997601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19391997601) 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 in 17 ways as a sum of consecutive naturals, for example, 2649513 + ... + 2656821.

Almost surely, 2^19391997603 is an apocalyptic number.

19391997603 is a deficient number, since it is larger than the sum of its proper divisors (9032119209).

19391997603 is an frugal number, since it uses more digits than its factorization.

19391997603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14643 (or 7323 counting only the distinct ones).

The product of its (nonzero) digits is 2480058, while the sum is 57.

The spelling of 19391997603 in words is "nineteen billion, three hundred ninety-one million, nine hundred ninety-seven thousand, six hundred three".