509618534785 has 4 divisors (see below), whose sum is σ = 611542241748. Its totient is φ = 407694827824.

The previous prime is 509618534783. The next prime is 509618534797. The reversal of 509618534785 is 587435816905.

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 69763072129 + 439855462656 = 264127^2 + 663216^2 .

It is a cyclic number.

It is not a de Polignac number, because 509618534785 - 2¹ = 509618534783 is a prime.

It is a super-2 number, since 2×509618534785² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (509618534783) 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, 50961853474 + ... + 50961853483.

It is an arithmetic number, because the mean of its divisors is an integer number (152885560437).

Almost surely, 2^509618534785 is an apocalyptic number.

It is an amenable number.

509618534785 is a deficient number, since it is larger than the sum of its proper divisors (101923706963).

509618534785 is a wasteful number, since it uses less digits than its factorization.

509618534785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101923706962.

The product of its (nonzero) digits is 36288000, while the sum is 61.

The spelling of 509618534785 in words is "five hundred nine billion, six hundred eighteen million, five hundred thirty-four thousand, seven hundred eighty-five".