12055215155 has 4 divisors (see below), whose sum is σ = 14466258192. Its totient is φ = 9644172120.

The previous prime is 12055215149. The next prime is 12055215157. The reversal of 12055215155 is 55151255021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55151255021 = 13693 ⋅4027697.

It is not a de Polignac number, because 12055215155 - 2¹⁶ = 12055149619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12055215157) 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, 1205521511 + ... + 1205521520.

It is an arithmetic number, because the mean of its divisors is an integer number (3616564548).

Almost surely, 2^12055215155 is an apocalyptic number.

12055215155 is a deficient number, since it is larger than the sum of its proper divisors (2411043037).

12055215155 is an equidigital number, since it uses as much as digits as its factorization.

12055215155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2411043036.

The product of its (nonzero) digits is 12500, while the sum is 32.

The spelling of 12055215155 in words is "twelve billion, fifty-five million, two hundred fifteen thousand, one hundred fifty-five".