509945020388 has 12 divisors (see below), whose sum is σ = 894391325100. Its totient is φ = 254404641792.

The previous prime is 509945020357. The next prime is 509945020393. The reversal of 509945020388 is 883020549905.

It can be written as a sum of positive squares in 2 ways, for example, as 204911939584 + 305033080804 = 452672^2 + 552298^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141965081 + ... + 141968672.

It is an arithmetic number, because the mean of its divisors is an integer number (74532610425).

Almost surely, 2^509945020388 is an apocalyptic number.

It is an amenable number.

509945020388 is a deficient number, since it is larger than the sum of its proper divisors (384446304712).

509945020388 is a wasteful number, since it uses less digits than its factorization.

509945020388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283934206 (or 283934204 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 53.

The spelling of 509945020388 in words is "five hundred nine billion, nine hundred forty-five million, twenty thousand, three hundred eighty-eight".