19781415203 has 16 divisors (see below), whose sum is σ = 22859581536. Its totient is φ = 16917527040.

The previous prime is 19781415179. The next prime is 19781415209. The reversal of 19781415203 is 30251418791.

It is a cyclic number.

It is not a de Polignac number, because 19781415203 - 2¹⁰ = 19781414179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19781415209) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 405725 + ... + 451857.

It is an arithmetic number, because the mean of its divisors is an integer number (1428723846).

Almost surely, 2^19781415203 is an apocalyptic number.

19781415203 is a deficient number, since it is larger than the sum of its proper divisors (3078166333).

19781415203 is a wasteful number, since it uses less digits than its factorization.

19781415203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48454.

The product of its (nonzero) digits is 60480, while the sum is 41.

The spelling of 19781415203 in words is "nineteen billion, seven hundred eighty-one million, four hundred fifteen thousand, two hundred three".