19804005363381 has 4 divisors (see below), whose sum is σ = 26405340484512. Its totient is φ = 13202670242252.

The previous prime is 19804005363377. The next prime is 19804005363409. The reversal of 19804005363381 is 18336350040891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19804005363381 - 2² = 19804005363377 is a prime.

It is a super-2 number, since 2×19804005363381² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19804005362381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3300667560561 + ... + 3300667560566.

It is an arithmetic number, because the mean of its divisors is an integer number (6601335121128).

Almost surely, 2^{19804005363381} is an apocalyptic number.

It is an amenable number.

19804005363381 is a deficient number, since it is larger than the sum of its proper divisors (6601335121131).

19804005363381 is an equidigital number, since it uses as much as digits as its factorization.

19804005363381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6601335121130.

The product of its (nonzero) digits is 1866240, while the sum is 51.

The spelling of 19804005363381 in words is "nineteen trillion, eight hundred four billion, five million, three hundred sixty-three thousand, three hundred eighty-one".