12123512155 has 8 divisors (see below), whose sum is σ = 14576799600. Its totient is φ = 9679753056.

The previous prime is 12123512123. The next prime is 12123512171. The reversal of 12123512155 is 55121532121.

It is a happy number.

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 12123512155 - 2⁵ = 12123512123 is a prime.

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, 2379285 + ... + 2384374.

It is an arithmetic number, because the mean of its divisors is an integer number (1822099950).

Almost surely, 2^12123512155 is an apocalyptic number.

12123512155 is a deficient number, since it is larger than the sum of its proper divisors (2453287445).

12123512155 is an equidigital number, since it uses as much as digits as its factorization.

12123512155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4764173.

The product of its digits is 3000, while the sum is 28.

The spelling of 12123512155 in words is "twelve billion, one hundred twenty-three million, five hundred twelve thousand, one hundred fifty-five".