19663413381 has 12 divisors (see below), whose sum is σ = 28721840940. Its totient is φ = 12961650240.

The previous prime is 19663413349. The next prime is 19663413397. The reversal of 19663413381 is 18331436691.

It is a happy number.

19663413381 is a `hidden beast` number, since 1 + 9 + 6 + 634 + 1 + 3 + 3 + 8 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2493504225 + 17169909156 = 49935^2 + 131034^2 .

It is not a de Polignac number, because 19663413381 - 2⁵ = 19663413349 is a prime.

It is a super-2 number, since 2×19663413381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19663413281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12273490 + ... + 12275091.

It is an arithmetic number, because the mean of its divisors is an integer number (2393486745).

Almost surely, 2^19663413381 is an apocalyptic number.

It is an amenable number.

19663413381 is a deficient number, since it is larger than the sum of its proper divisors (9058427559).

19663413381 is a wasteful number, since it uses less digits than its factorization.

19663413381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24548676 (or 24548673 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The spelling of 19663413381 in words is "nineteen billion, six hundred sixty-three million, four hundred thirteen thousand, three hundred eighty-one".