816456816349 has 2 divisors, whose sum is σ = 816456816350. Its totient is φ = 816456816348.

The previous prime is 816456816347. The next prime is 816456816403. The reversal of 816456816349 is 943618654618.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 541416356100 + 275040460249 = 735810^2 + 524443^2 .

It is a cyclic number.

It is not a de Polignac number, because 816456816349 - 2¹ = 816456816347 is a prime.

Together with 816456816347, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (816456816347) 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, 408228408174 + 408228408175.

It is an arithmetic number, because the mean of its divisors is an integer number (408228408175).

Almost surely, 2^816456816349 is an apocalyptic number.

It is an amenable number.

816456816349 is a deficient number, since it is larger than the sum of its proper divisors (1).

816456816349 is an equidigital number, since it uses as much as digits as its factorization.

816456816349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29859840, while the sum is 61.

The spelling of 816456816349 in words is "eight hundred sixteen billion, four hundred fifty-six million, eight hundred sixteen thousand, three hundred forty-nine".