138033638638 has 32 divisors (see below), whose sum is σ = 238763036160. Its totient is φ = 58625030880.

The previous prime is 138033638521. The next prime is 138033638653. The reversal of 138033638638 is 836836330831.

It is a happy number.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1292983 + ... + 1395661.

It is an arithmetic number, because the mean of its divisors is an integer number (7461344880).

Almost surely, 2^138033638638 is an apocalyptic number.

138033638638 is a deficient number, since it is larger than the sum of its proper divisors (100729397522).

138033638638 is a wasteful number, since it uses less digits than its factorization.

138033638638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103552.

The product of its (nonzero) digits is 4478976, while the sum is 52.

The spelling of 138033638638 in words is "one hundred thirty-eight billion, thirty-three million, six hundred thirty-eight thousand, six hundred thirty-eight".