19811364804 has 576 divisors, whose sum is σ = 68971714560. Its totient is φ = 4772908800.

The previous prime is 19811364799. The next prime is 19811364857. The reversal of 19811364804 is 40846311891.

It is a self number, because there is not a number n which added to its sum of digits gives 19811364804.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 295691979 + ... + 295692045.

It is an arithmetic number, because the mean of its divisors is an integer number (119742560).

Almost surely, 2^19811364804 is an apocalyptic number.

19811364804 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19811364804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34485857280).

19811364804 is an abundant number, since it is smaller than the sum of its proper divisors (49160349756).

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

19811364804 is a wasteful number, since it uses less digits than its factorization.

19811364804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197 (or 158 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The spelling of 19811364804 in words is "nineteen billion, eight hundred eleven million, three hundred sixty-four thousand, eight hundred four".