509946203809 has 8 divisors (see below), whose sum is σ = 582966446400. Its totient is φ = 436968657456.

The previous prime is 509946203797. The next prime is 509946203827. The reversal of 509946203809 is 908302649905.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 509946203809 - 2¹⁷ = 509946072737 is a prime.

It is a super-2 number, since 2×509946203809² (a number of 24 digits) contains 22 as substring.

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 509946203809.

It is not an unprimeable number, because it can be changed into a prime (509946203009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10648459 + ... + 10696240.

It is an arithmetic number, because the mean of its divisors is an integer number (72870805800).

Almost surely, 2^509946203809 is an apocalyptic number.

It is an amenable number.

509946203809 is a deficient number, since it is larger than the sum of its proper divisors (73020242591).

509946203809 is a wasteful number, since it uses less digits than its factorization.

509946203809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21348119.

The product of its (nonzero) digits is 4199040, while the sum is 55.

The spelling of 509946203809 in words is "five hundred nine billion, nine hundred forty-six million, two hundred three thousand, eight hundred nine".