509479743844 has 12 divisors (see below), whose sum is σ = 891596175484. Its totient is φ = 254737979424.

The previous prime is 509479743833. The next prime is 509479743847. The reversal of 509479743844 is 448347974905.

It can be written as a sum of positive squares in 2 ways, for example, as 305022034944 + 204457708900 = 552288^2 + 452170^2 .

It is not an unprimeable number, because it can be changed into a prime (509479743847) 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, 258202 + ... + 1041934.

Almost surely, 2^509479743844 is an apocalyptic number.

It is an amenable number.

509479743844 is a deficient number, since it is larger than the sum of its proper divisors (382116431640).

509479743844 is a wasteful number, since it uses less digits than its factorization.

509479743844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 946254 (or 946252 counting only the distinct ones).

The product of its (nonzero) digits is 121927680, while the sum is 64.

The spelling of 509479743844 in words is "five hundred nine billion, four hundred seventy-nine million, seven hundred forty-three thousand, eight hundred forty-four".