816456816403 has 2 divisors, whose sum is σ = 816456816404. Its totient is φ = 816456816402.

The previous prime is 816456816349. The next prime is 816456816421. The reversal of 816456816403 is 304618654618.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 816456816403 - 2²¹ = 816454719251 is a prime.

It is a super-3 number, since 3×816456816403³ (a number of 37 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (816456817403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408228408201 + 408228408202.

It is an arithmetic number, because the mean of its divisors is an integer number (408228408202).

Almost surely, 2^816456816403 is an apocalyptic number.

816456816403 is a deficient number, since it is larger than the sum of its proper divisors (1).

816456816403 is an equidigital number, since it uses as much as digits as its factorization.

816456816403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3317760, while the sum is 52.

The spelling of 816456816403 in words is "eight hundred sixteen billion, four hundred fifty-six million, eight hundred sixteen thousand, four hundred three".