819977993903 has 2 divisors, whose sum is σ = 819977993904. Its totient is φ = 819977993902.

The previous prime is 819977993893. The next prime is 819977993977. The reversal of 819977993903 is 309399779918.

It is an a-pointer prime, because the next prime (819977993977) can be obtained adding 819977993903 to its sum of digits (74).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 819977993903 - 2⁶ = 819977993839 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (819977993983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409988996951 + 409988996952.

It is an arithmetic number, because the mean of its divisors is an integer number (409988996952).

Almost surely, 2^819977993903 is an apocalyptic number.

819977993903 is a deficient number, since it is larger than the sum of its proper divisors (1).

819977993903 is an equidigital number, since it uses as much as digits as its factorization.

819977993903 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 208324872, while the sum is 74.

The spelling of 819977993903 in words is "eight hundred nineteen billion, nine hundred seventy-seven million, nine hundred ninety-three thousand, nine hundred three".