905044404689 has 4 divisors (see below), whose sum is σ = 905897416500. Its totient is φ = 904191392880.

The previous prime is 905044404683. The next prime is 905044404701. The reversal of 905044404689 is 986404440509.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 986404440509 = 13633 ⋅72354173.

It can be written as a sum of positive squares in 2 ways, for example, as 418143289600 + 486901115089 = 646640^2 + 697783^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-905044404689 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 905044404689.

It is not an unprimeable number, because it can be changed into a prime (905044404683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 426504314 + ... + 426506435.

It is an arithmetic number, because the mean of its divisors is an integer number (226474354125).

Almost surely, 2^905044404689 is an apocalyptic number.

It is an amenable number.

905044404689 is a deficient number, since it is larger than the sum of its proper divisors (853011811).

905044404689 is a wasteful number, since it uses less digits than its factorization.

905044404689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 853011810.

The product of its (nonzero) digits is 4976640, while the sum is 53.

The spelling of 905044404689 in words is "nine hundred five billion, forty-four million, four hundred four thousand, six hundred eighty-nine".