19603663218 has 12 divisors (see below), whose sum is σ = 42474603678. Its totient is φ = 6534554400.

The previous prime is 19603663213. The next prime is 19603663259. The reversal of 19603663218 is 81236630691.

19603663218 is a `hidden beast` number, since 1 + 9 + 6 + 0 + 3 + 6 + 632 + 1 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 14814054369 + 4789608849 = 121713^2 + 69207^2 .

It is a super-2 number, since 2×19603663218² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19603663213) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 544546183 + ... + 544546218.

Almost surely, 2^19603663218 is an apocalyptic number.

19603663218 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19603663218 is an abundant number, since it is smaller than the sum of its proper divisors (22870940460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19603663218 is a wasteful number, since it uses less digits than its factorization.

19603663218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1089092409 (or 1089092406 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The spelling of 19603663218 in words is "nineteen billion, six hundred three million, six hundred sixty-three thousand, two hundred eighteen".