809946959677 has 4 divisors (see below), whose sum is σ = 810019462300. Its totient is φ = 809874457056.

The previous prime is 809946959641. The next prime is 809946959699. The reversal of 809946959677 is 776959649908.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 205765660996 + 604181298681 = 453614^2 + 777291^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-809946959677 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 809946959597 and 809946959606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809946959177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36234552 + ... + 36256897.

It is an arithmetic number, because the mean of its divisors is an integer number (202504865575).

Almost surely, 2^809946959677 is an apocalyptic number.

It is an amenable number.

809946959677 is a deficient number, since it is larger than the sum of its proper divisors (72502623).

809946959677 is a wasteful number, since it uses less digits than its factorization.

809946959677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72502622.

The product of its (nonzero) digits is 1851776640, while the sum is 79.

The spelling of 809946959677 in words is "eight hundred nine billion, nine hundred forty-six million, nine hundred fifty-nine thousand, six hundred seventy-seven".