2118556986811 has 2 divisors, whose sum is σ = 2118556986812. Its totient is φ = 2118556986810.

The previous prime is 2118556986803. The next prime is 2118556986857. The reversal of 2118556986811 is 1186896558112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2118556986811 - 2³ = 2118556986803 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2118556986811.

It is not a weakly prime, because it can be changed into another prime (2118556986011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1059278493405 + 1059278493406.

It is an arithmetic number, because the mean of its divisors is an integer number (1059278493406).

Almost surely, 2^{2118556986811} is an apocalyptic number.

2118556986811 is a deficient number, since it is larger than the sum of its proper divisors (1).

2118556986811 is an equidigital number, since it uses as much as digits as its factorization.

2118556986811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8294400, while the sum is 61.

The spelling of 2118556986811 in words is "two trillion, one hundred eighteen billion, five hundred fifty-six million, nine hundred eighty-six thousand, eight hundred eleven".