513256106663 has 4 divisors (see below), whose sum is σ = 513263851128. Its totient is φ = 513248362200.

The previous prime is 513256106659. The next prime is 513256106743. The reversal of 513256106663 is 366601652315.

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 513256106663 - 2² = 513256106659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513256106603) 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, 3771956 + ... + 3905657.

It is an arithmetic number, because the mean of its divisors is an integer number (128315962782).

Almost surely, 2^513256106663 is an apocalyptic number.

513256106663 is a deficient number, since it is larger than the sum of its proper divisors (7744465).

513256106663 is an equidigital number, since it uses as much as digits as its factorization.

513256106663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7744464.

The product of its (nonzero) digits is 583200, while the sum is 44.

Adding to 513256106663 its reverse (366601652315), we get a palindrome (879857758978).

The spelling of 513256106663 in words is "five hundred thirteen billion, two hundred fifty-six million, one hundred six thousand, six hundred sixty-three".