516145975489 has 3 divisors (see below), whose sum is σ = 516146693923. Its totient is φ = 516145257056.

The previous prime is 516145975469. The next prime is 516145975529. The reversal of 516145975489 is 984579541615.

The square root of 516145975489 is 718433.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 984579541615 = 5 ⋅196915908323.

It can be written as a sum of positive squares in only one way, i.e., 513207468225 + 2938507264 = 716385^2 + 54208^2 .

It is a de Polignac number, because none of the positive numbers 2^k-516145975489 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 516145975489.

It is not an unprimeable number, because it can be changed into a prime (516145975469) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 359217 + ... + 1077649.

Almost surely, 2^516145975489 is an apocalyptic number.

516145975489 is the 718433-rd square number.

516145975489 is the 359217-th centered octagonal number.

It is an amenable number.

516145975489 is a deficient number, since it is larger than the sum of its proper divisors (718434).

516145975489 is an frugal number, since it uses more digits than its factorization.

516145975489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1436866 (or 718433 counting only the distinct ones).

The product of its digits is 54432000, while the sum is 64.

Multiplying 516145975489 by its sum of digits (64), we get a square (33033342431296 = 5747464²).

The spelling of 516145975489 in words is "five hundred sixteen billion, one hundred forty-five million, nine hundred seventy-five thousand, four hundred eighty-nine".