511668538 has 8 divisors (see below), whose sum is σ = 771743700. Its totient is φ = 254420640.

The previous prime is 511668517. The next prime is 511668539. The reversal of 511668538 is 835866115.

It can be written as a sum of positive squares in 2 ways, for example, as 385847449 + 125821089 = 19643^2 + 11217^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 511668494 and 511668503.

It is not an unprimeable number, because it can be changed into a prime (511668539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 706363 + ... + 707086.

Almost surely, 2^511668538 is an apocalyptic number.

511668538 is a deficient number, since it is larger than the sum of its proper divisors (260075162).

511668538 is a wasteful number, since it uses less digits than its factorization.

511668538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1413632.

The product of its digits is 172800, while the sum is 43.

The square root of 511668538 is about 22620.0914675427. The cubic root of 511668538 is about 799.8273262741.

The spelling of 511668538 in words is "five hundred eleven million, six hundred sixty-eight thousand, five hundred thirty-eight".