19812108603 has 24 divisors (see below), whose sum is σ = 30821897280. Its totient is φ = 11286974160.

The previous prime is 19812108599. The next prime is 19812108637. The reversal of 19812108603 is 30680121891.

It is not a de Polignac number, because 19812108603 - 2² = 19812108599 is a prime.

It is a super-2 number, since 2×19812108603² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19812108653) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 154933 + ... + 252246.

It is an arithmetic number, because the mean of its divisors is an integer number (1284245720).

Almost surely, 2^19812108603 is an apocalyptic number.

19812108603 is a deficient number, since it is larger than the sum of its proper divisors (11009788677).

19812108603 is a wasteful number, since it uses less digits than its factorization.

19812108603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407527 (or 407520 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 39.

The spelling of 19812108603 in words is "nineteen billion, eight hundred twelve million, one hundred eight thousand, six hundred three".