2185565655839 has 2 divisors, whose sum is σ = 2185565655840. Its totient is φ = 2185565655838.

The previous prime is 2185565655751. The next prime is 2185565655881. The reversal of 2185565655839 is 9385565655812.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2185565655839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2185565652839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1092782827919 + 1092782827920.

It is an arithmetic number, because the mean of its divisors is an integer number (1092782827920).

Almost surely, 2^{2185565655839} is an apocalyptic number.

2185565655839 is a deficient number, since it is larger than the sum of its proper divisors (1).

2185565655839 is an equidigital number, since it uses as much as digits as its factorization.

2185565655839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 388800000, while the sum is 68.

The spelling of 2185565655839 in words is "two trillion, one hundred eighty-five billion, five hundred sixty-five million, six hundred fifty-five thousand, eight hundred thirty-nine".