12138723455 has 8 divisors (see below), whose sum is σ = 15199792992. Its totient is φ = 9288762208.

The previous prime is 12138723431. The next prime is 12138723461. The reversal of 12138723455 is 55432783121.

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

It is a cyclic number.

It is not a de Polignac number, because 12138723455 - 2³² = 7843756159 is a prime.

It is a Duffinian number.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 52776944 + ... + 52777173.

It is an arithmetic number, because the mean of its divisors is an integer number (1899974124).

Almost surely, 2^12138723455 is an apocalyptic number.

12138723455 is a deficient number, since it is larger than the sum of its proper divisors (3061069537).

12138723455 is a wasteful number, since it uses less digits than its factorization.

12138723455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105554145.

The product of its digits is 201600, while the sum is 41.

The spelling of 12138723455 in words is "twelve billion, one hundred thirty-eight million, seven hundred twenty-three thousand, four hundred fifty-five".