12178705538 has 8 divisors (see below), whose sum is σ = 19229535120. Its totient is φ = 5768860500.

The previous prime is 12178705507. The next prime is 12178705549. The reversal of 12178705538 is 83550787121.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 12178705492 and 12178705501.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160246088 + ... + 160246163.

It is an arithmetic number, because the mean of its divisors is an integer number (2403691890).

Almost surely, 2^12178705538 is an apocalyptic number.

12178705538 is a deficient number, since it is larger than the sum of its proper divisors (7050829582).

12178705538 is a wasteful number, since it uses less digits than its factorization.

12178705538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320492272.

The product of its (nonzero) digits is 470400, while the sum is 47.

The spelling of 12178705538 in words is "twelve billion, one hundred seventy-eight million, seven hundred five thousand, five hundred thirty-eight".