19638320805 has 192 divisors, whose sum is σ = 38469150720. Its totient is φ = 9584822016.

The previous prime is 19638320773. The next prime is 19638320869. The reversal of 19638320805 is 50802383691.

It is a happy number.

19638320805 is a `hidden beast` number, since 1 + 9 + 638 + 3 + 2 + 0 + 8 + 0 + 5 = 666.

It is not a de Polignac number, because 19638320805 - 2⁵ = 19638320773 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

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 191 ways as a sum of consecutive naturals, for example, 70896327 + ... + 70896603.

It is an arithmetic number, because the mean of its divisors is an integer number (200360160).

Almost surely, 2^19638320805 is an apocalyptic number.

19638320805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19638320805 is a deficient number, since it is larger than the sum of its proper divisors (18830829915).

19638320805 is a wasteful number, since it uses less digits than its factorization.

19638320805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422 (or 410 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The spelling of 19638320805 in words is "nineteen billion, six hundred thirty-eight million, three hundred twenty thousand, eight hundred five".