19864388268 has 24 divisors (see below), whose sum is σ = 51500266160. Its totient is φ = 6621462720.

The previous prime is 19864388263. The next prime is 19864388321. The reversal of 19864388268 is 86288346891.

19864388268 is a `hidden beast` number, since 198 + 6 + 4 + 388 + 2 + 68 = 666.

It is not an unprimeable number, because it can be changed into a prime (19864388263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91964653 + ... + 91964868.

Almost surely, 2^19864388268 is an apocalyptic number.

19864388268 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

19864388268 is an abundant number, since it is smaller than the sum of its proper divisors (31635877892).

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

19864388268 is a wasteful number, since it uses less digits than its factorization.

19864388268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183929534 (or 183929526 counting only the distinct ones).

The product of its digits is 31850496, while the sum is 63.

The spelling of 19864388268 in words is "nineteen billion, eight hundred sixty-four million, three hundred eighty-eight thousand, two hundred sixty-eight".