513216565645 has 32 divisors (see below), whose sum is σ = 706676889600. Its totient is φ = 350502494976.

The previous prime is 513216565621. The next prime is 513216565691. The reversal of 513216565645 is 546565612315.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 513216565645 - 2¹⁹ = 513216041357 is a prime.

It is a super-3 number, since 3×513216565645³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26350971 + ... + 26370439.

It is an arithmetic number, because the mean of its divisors is an integer number (22083652800).

Almost surely, 2^513216565645 is an apocalyptic number.

It is an amenable number.

513216565645 is a deficient number, since it is larger than the sum of its proper divisors (193460323955).

513216565645 is a wasteful number, since it uses less digits than its factorization.

513216565645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22477.

The product of its digits is 3240000, while the sum is 49.

The spelling of 513216565645 in words is "five hundred thirteen billion, two hundred sixteen million, five hundred sixty-five thousand, six hundred forty-five".