12155550772441 has 2 divisors, whose sum is σ = 12155550772442. Its totient is φ = 12155550772440.

The previous prime is 12155550772381. The next prime is 12155550772591. The reversal of 12155550772441 is 14427705555121.

12155550772441 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7520916820041 + 4634633952400 = 2742429^2 + 2152820^2 .

It is an emirp because it is prime and its reverse (14427705555121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12155550772441 - 2²³ = 12155542383833 is a prime.

It is not a weakly prime, because it can be changed into another prime (12155550572441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6077775386220 + 6077775386221.

It is an arithmetic number, because the mean of its divisors is an integer number (6077775386221).

Almost surely, 2^{12155550772441} is an apocalyptic number.

It is an amenable number.

12155550772441 is a deficient number, since it is larger than the sum of its proper divisors (1).

12155550772441 is an equidigital number, since it uses as much as digits as its factorization.

12155550772441 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1960000, while the sum is 49.

The spelling of 12155550772441 in words is "twelve trillion, one hundred fifty-five billion, five hundred fifty million, seven hundred seventy-two thousand, four hundred forty-one".