2156320534349 has 2 divisors, whose sum is σ = 2156320534350. Its totient is φ = 2156320534348.

The previous prime is 2156320534331. The next prime is 2156320534351. The reversal of 2156320534349 is 9434350236512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2136911865124 + 19408669225 = 1461818^2 + 139315^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2156320534349 is a prime.

Together with 2156320534351, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2156320534309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078160267174 + 1078160267175.

It is an arithmetic number, because the mean of its divisors is an integer number (1078160267175).

Almost surely, 2^{2156320534349} is an apocalyptic number.

It is an amenable number.

2156320534349 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156320534349 is an equidigital number, since it uses as much as digits as its factorization.

2156320534349 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2332800, while the sum is 47.

The spelling of 2156320534349 in words is "two trillion, one hundred fifty-six billion, three hundred twenty million, five hundred thirty-four thousand, three hundred forty-nine".