19686629821338 has 48 divisors (see below), whose sum is σ = 45267748756776. Its totient is φ = 6161933813760.

The previous prime is 19686629821277. The next prime is 19686629821349. The reversal of 19686629821338 is 83312892668691.

It is a happy number.

19686629821338 is a `hidden beast` number, since 1 + 9 + 68 + 66 + 298 + 213 + 3 + 8 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 13457796869169 + 6228832952169 = 3668487^2 + 2495763^2 .

It is a super-2 number, since 2×19686629821338² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 74157793 + ... + 74422788.

Almost surely, 2^{19686629821338} is an apocalyptic number.

19686629821338 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19686629821338 is an abundant number, since it is smaller than the sum of its proper divisors (25581118935438).

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

19686629821338 is a wasteful number, since it uses less digits than its factorization.

19686629821338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148581039 (or 148581036 counting only the distinct ones).

The product of its digits is 322486272, while the sum is 72.

The spelling of 19686629821338 in words is "nineteen trillion, six hundred eighty-six billion, six hundred twenty-nine million, eight hundred twenty-one thousand, three hundred thirty-eight".