12155555541 has 4 divisors (see below), whose sum is σ = 16207407392. Its totient is φ = 8103703692.

The previous prime is 12155555471. The next prime is 12155555557. The reversal of 12155555541 is 14555555121.

12155555541 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14555555121 = 3 ⋅4851851707.

It is not a de Polignac number, because 12155555541 - 2⁹ = 12155555029 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12155555541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12155559541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2025925921 + ... + 2025925926.

It is an arithmetic number, because the mean of its divisors is an integer number (4051851848).

Almost surely, 2^12155555541 is an apocalyptic number.

It is an amenable number.

12155555541 is a deficient number, since it is larger than the sum of its proper divisors (4051851851).

12155555541 is an equidigital number, since it uses as much as digits as its factorization.

12155555541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4051851850.

The product of its digits is 125000, while the sum is 39.

The spelling of 12155555541 in words is "twelve billion, one hundred fifty-five million, five hundred fifty-five thousand, five hundred forty-one".