19784900948791 has 16 divisors (see below), whose sum is σ = 21596339640960. Its totient is φ = 17975599152480.

The previous prime is 19784900948711. The next prime is 19784900948833.

19784900948791 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 19784900948791 - 2⁹ = 19784900948279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19784900948711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 288893445 + ... + 288961921.

It is an arithmetic number, because the mean of its divisors is an integer number (1349771227560).

Almost surely, 2^{19784900948791} is an apocalyptic number.

19784900948791 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

19784900948791 is a deficient number, since it is larger than the sum of its proper divisors (1811438692169).

19784900948791 is a wasteful number, since it uses less digits than its factorization.

19784900948791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83694.

The product of its (nonzero) digits is 329204736, while the sum is 76.

The spelling of 19784900948791 in words is "nineteen trillion, seven hundred eighty-four billion, nine hundred million, nine hundred forty-eight thousand, seven hundred ninety-one".