513203445663 has 4 divisors (see below), whose sum is σ = 684271260888. Its totient is φ = 342135630440.

The previous prime is 513203445649. The next prime is 513203445721. The reversal of 513203445663 is 366544302315.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 513203445663 - 2²⁰ = 513202397087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513203445563) 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, 85533907608 + ... + 85533907613.

It is an arithmetic number, because the mean of its divisors is an integer number (171067815222).

Almost surely, 2^513203445663 is an apocalyptic number.

513203445663 is a deficient number, since it is larger than the sum of its proper divisors (171067815225).

513203445663 is a wasteful number, since it uses less digits than its factorization.

513203445663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171067815224.

The product of its (nonzero) digits is 777600, while the sum is 42.

Adding to 513203445663 its reverse (366544302315), we get a palindrome (879747747978).

The spelling of 513203445663 in words is "five hundred thirteen billion, two hundred three million, four hundred forty-five thousand, six hundred sixty-three".