19449178681138 has 8 divisors (see below), whose sum is σ = 29173959586332. Its totient is φ = 9724525485696.

The previous prime is 19449178681069. The next prime is 19449178681201. The reversal of 19449178681138 is 83118687194491.

It can be written as a sum of positive squares in 2 ways, for example, as 19194711905329 + 254466775809 = 4381177^2 + 504447^2 .

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

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, 31545795 + ... + 32156422.

Almost surely, 2^{19449178681138} is an apocalyptic number.

19449178681138 is a deficient number, since it is larger than the sum of its proper divisors (9724780905194).

19449178681138 is a wasteful number, since it uses less digits than its factorization.

19449178681138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63854876.

The product of its digits is 83607552, while the sum is 70.

The spelling of 19449178681138 in words is "nineteen trillion, four hundred forty-nine billion, one hundred seventy-eight million, six hundred eighty-one thousand, one hundred thirty-eight".