513308475865 has 4 divisors (see below), whose sum is σ = 615970171044. Its totient is φ = 410646780688.

The previous prime is 513308475863. The next prime is 513308475871. The reversal of 513308475865 is 568574803315.

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

It can be written as a sum of positive squares in 2 ways, for example, as 260609229001 + 252699246864 = 510499^2 + 502692^2 .

It is a cyclic number.

It is not a de Polignac number, because 513308475865 - 2¹ = 513308475863 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (513308475863) 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, 51330847582 + ... + 51330847591.

It is an arithmetic number, because the mean of its divisors is an integer number (153992542761).

Almost surely, 2^513308475865 is an apocalyptic number.

It is an amenable number.

513308475865 is a deficient number, since it is larger than the sum of its proper divisors (102661695179).

513308475865 is a wasteful number, since it uses less digits than its factorization.

513308475865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102661695178.

The product of its (nonzero) digits is 12096000, while the sum is 55.

The spelling of 513308475865 in words is "five hundred thirteen billion, three hundred eight million, four hundred seventy-five thousand, eight hundred sixty-five".