138223678534 has 4 divisors (see below), whose sum is σ = 207335517804. Its totient is φ = 69111839266.

The previous prime is 138223678513. The next prime is 138223678583. The reversal of 138223678534 is 435876322831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 435876322831 = 39953 ⋅10909727.

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 as a sum of consecutive naturals, namely, 34555919632 + ... + 34555919635.

It is an arithmetic number, because the mean of its divisors is an integer number (51833879451).

Almost surely, 2^138223678534 is an apocalyptic number.

138223678534 is a deficient number, since it is larger than the sum of its proper divisors (69111839270).

138223678534 is an equidigital number, since it uses as much as digits as its factorization.

138223678534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69111839269.

The product of its digits is 5806080, while the sum is 52.

The spelling of 138223678534 in words is "one hundred thirty-eight billion, two hundred twenty-three million, six hundred seventy-eight thousand, five hundred thirty-four".