819699943417 has 2 divisors, whose sum is σ = 819699943418. Its totient is φ = 819699943416.

The previous prime is 819699943411. The next prime is 819699943493. The reversal of 819699943417 is 714349996918.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 578544305641 + 241155637776 = 760621^2 + 491076^2 .

It is a cyclic number.

It is not a de Polignac number, because 819699943417 - 2¹⁵ = 819699910649 is a prime.

It is not a weakly prime, because it can be changed into another prime (819699943411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409849971708 + 409849971709.

It is an arithmetic number, because the mean of its divisors is an integer number (409849971709).

Almost surely, 2^819699943417 is an apocalyptic number.

It is an amenable number.

819699943417 is a deficient number, since it is larger than the sum of its proper divisors (1).

819699943417 is an equidigital number, since it uses as much as digits as its factorization.

819699943417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105815808, while the sum is 70.

The spelling of 819699943417 in words is "eight hundred nineteen billion, six hundred ninety-nine million, nine hundred forty-three thousand, four hundred seventeen".