819457886669 has 2 divisors, whose sum is σ = 819457886670. Its totient is φ = 819457886668.

The previous prime is 819457886609. The next prime is 819457886671. The reversal of 819457886669 is 966688754918.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 555248522500 + 264209364169 = 745150^2 + 514013^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-819457886669 is a prime.

It is a super-2 number, since 2×819457886669² (a number of 25 digits) contains 22 as substring.

Together with 819457886671, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 819457886669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (819457886609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409728943334 + 409728943335.

It is an arithmetic number, because the mean of its divisors is an integer number (409728943335).

Almost surely, 2^819457886669 is an apocalyptic number.

It is an amenable number.

819457886669 is a deficient number, since it is larger than the sum of its proper divisors (1).

819457886669 is an equidigital number, since it uses as much as digits as its factorization.

819457886669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1254113280, while the sum is 77.

The spelling of 819457886669 in words is "eight hundred nineteen billion, four hundred fifty-seven million, eight hundred eighty-six thousand, six hundred sixty-nine".