513665304644 has 6 divisors (see below), whose sum is σ = 898914283134. Its totient is φ = 256832652320.

The previous prime is 513665304641. The next prime is 513665304661. The reversal of 513665304644 is 446403566315.

It can be written as a sum of positive squares in only one way, i.e., 512888010244 + 777294400 = 716162^2 + 27880^2 .

It is not an unprimeable number, because it can be changed into a prime (513665304641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64208163077 + ... + 64208163084.

It is an arithmetic number, because the mean of its divisors is an integer number (149819047189).

Almost surely, 2^513665304644 is an apocalyptic number.

It is an amenable number.

513665304644 is a deficient number, since it is larger than the sum of its proper divisors (385248978490).

513665304644 is a wasteful number, since it uses less digits than its factorization.

513665304644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128416326165 (or 128416326163 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 47.

The spelling of 513665304644 in words is "five hundred thirteen billion, six hundred sixty-five million, three hundred four thousand, six hundred forty-four".