509161208868 has 72 divisors (see below), whose sum is σ = 1402749461568. Its totient is φ = 154777445568.

The previous prime is 509161208863. The next prime is 509161208869. The reversal of 509161208868 is 868802161905.

It is a happy number.

509161208868 is a `hidden beast` number, since 509 + 1 + 6 + 120 + 8 + 8 + 6 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (509161208863) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6515080 + ... + 6592767.

Almost surely, 2^509161208868 is an apocalyptic number.

It is an amenable number.

509161208868 is an abundant number, since it is smaller than the sum of its proper divisors (893588252700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

509161208868 is a wasteful number, since it uses less digits than its factorization.

509161208868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13107953 (or 13107948 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 54.

The spelling of 509161208868 in words is "five hundred nine billion, one hundred sixty-one million, two hundred eight thousand, eight hundred sixty-eight".