193438268018 has 6 divisors (see below), whose sum is σ = 290158335021. Its totient is φ = 96718823012.

The previous prime is 193438267969. The next prime is 193438268021. The reversal of 193438268018 is 810862834391.

193438268018 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 152863014529 + 40575253489 = 390977^2 + 201433^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=310997.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 466496 + ... + 777492.

Almost surely, 2^193438268018 is an apocalyptic number.

193438268018 is a deficient number, since it is larger than the sum of its proper divisors (96720067003).

193438268018 is an frugal number, since it uses more digits than its factorization.

193438268018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621996 (or 310999 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 53.

The spelling of 193438268018 in words is "one hundred ninety-three billion, four hundred thirty-eight million, two hundred sixty-eight thousand, eighteen".