19908449386158 has 8 divisors (see below), whose sum is σ = 39816898772328. Its totient is φ = 6636149795384.

The previous prime is 19908449386141. The next prime is 19908449386237. The reversal of 19908449386158 is 85168394480991.

It is a sphenic number, since it is the product of 3 distinct primes.

19908449386158 is an admirable number.

It is a super-2 number, since 2×19908449386158² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19908449386158.

It is a congruent number.

It is an unprimeable number.

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, 1659037448841 + ... + 1659037448852.

It is an arithmetic number, because the mean of its divisors is an integer number (4977112346541).

Almost surely, 2^{19908449386158} is an apocalyptic number.

19908449386158 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

19908449386158 is a wasteful number, since it uses less digits than its factorization.

19908449386158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3318074897698.

The product of its (nonzero) digits is 537477120, while the sum is 75.

The spelling of 19908449386158 in words is "nineteen trillion, nine hundred eight billion, four hundred forty-nine million, three hundred eighty-six thousand, one hundred fifty-eight".