12155004054605 has 4 divisors (see below), whose sum is σ = 14586004865532. Its totient is φ = 9724003243680.

The previous prime is 12155004054601. The next prime is 12155004054623. The reversal of 12155004054605 is 50645040055121.

12155004054605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7433709549289 + 4721294505316 = 2726483^2 + 2172854^2 .

It is not a de Polignac number, because 12155004054605 - 2² = 12155004054601 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12155004054601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1215500405456 + ... + 1215500405465.

It is an arithmetic number, because the mean of its divisors is an integer number (3646501216383).

Almost surely, 2^{12155004054605} is an apocalyptic number.

It is an amenable number.

12155004054605 is a deficient number, since it is larger than the sum of its proper divisors (2431000810927).

12155004054605 is an equidigital number, since it uses as much as digits as its factorization.

12155004054605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2431000810926.

The product of its (nonzero) digits is 120000, while the sum is 38.

The spelling of 12155004054605 in words is "twelve trillion, one hundred fifty-five billion, four million, fifty-four thousand, six hundred five".