12155243997811 has 2 divisors, whose sum is σ = 12155243997812. Its totient is φ = 12155243997810.

The previous prime is 12155243997763. The next prime is 12155243997863. The reversal of 12155243997811 is 11879934255121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12155243997811 - 2⁷ = 12155243997683 is a prime.

It is not a weakly prime, because it can be changed into another prime (12155243397811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6077621998905 + 6077621998906.

It is an arithmetic number, because the mean of its divisors is an integer number (6077621998906).

Almost surely, 2^{12155243997811} is an apocalyptic number.

12155243997811 is a deficient number, since it is larger than the sum of its proper divisors (1).

12155243997811 is an equidigital number, since it uses as much as digits as its factorization.

12155243997811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5443200, while the sum is 58.

The spelling of 12155243997811 in words is "twelve trillion, one hundred fifty-five billion, two hundred forty-three million, nine hundred ninety-seven thousand, eight hundred eleven".