12261555055 has 4 divisors (see below), whose sum is σ = 14713866072. Its totient is φ = 9809244040.

The previous prime is 12261555037. The next prime is 12261555071. The reversal of 12261555055 is 55055516221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55055516221 = 101 ⋅545104121.

It is not a de Polignac number, because 12261555055 - 2⁷ = 12261554927 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 1226155501 + ... + 1226155510.

It is an arithmetic number, because the mean of its divisors is an integer number (3678466518).

Almost surely, 2^12261555055 is an apocalyptic number.

12261555055 is a deficient number, since it is larger than the sum of its proper divisors (2452311017).

12261555055 is an equidigital number, since it uses as much as digits as its factorization.

12261555055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2452311016.

The product of its (nonzero) digits is 75000, while the sum is 37.

The spelling of 12261555055 in words is "twelve billion, two hundred sixty-one million, five hundred fifty-five thousand, fifty-five".