905860821773 has 2 divisors, whose sum is σ = 905860821774. Its totient is φ = 905860821772.

The previous prime is 905860821659. The next prime is 905860821779. The reversal of 905860821773 is 377128068509.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 476682538084 + 429178283689 = 690422^2 + 655117^2 .

It is a cyclic number.

It is not a de Polignac number, because 905860821773 - 2¹⁰ = 905860820749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (905860821779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 452930410886 + 452930410887.

It is an arithmetic number, because the mean of its divisors is an integer number (452930410887).

Almost surely, 2^905860821773 is an apocalyptic number.

It is an amenable number.

905860821773 is a deficient number, since it is larger than the sum of its proper divisors (1).

905860821773 is an equidigital number, since it uses as much as digits as its factorization.

905860821773 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5080320, while the sum is 56.

The spelling of 905860821773 in words is "nine hundred five billion, eight hundred sixty million, eight hundred twenty-one thousand, seven hundred seventy-three".