6516378325 has 6 divisors (see below), whose sum is σ = 8080309154. Its totient is φ = 5213102640.

The previous prime is 6516378311. The next prime is 6516378347. The reversal of 6516378325 is 5238736156.

It can be written as a sum of positive squares in 3 ways, for example, as 64112049 + 6452266276 = 8007^2 + 80326^2 .

It is a de Polignac number, because none of the positive numbers 2^k-6516378325 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 130327542 + ... + 130327591.

Almost surely, 2^6516378325 is an apocalyptic number.

It is an amenable number.

6516378325 is a deficient number, since it is larger than the sum of its proper divisors (1563930829).

6516378325 is a wasteful number, since it uses less digits than its factorization.

6516378325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260655143 (or 260655138 counting only the distinct ones).

The product of its digits is 907200, while the sum is 46.

The square root of 6516378325 is about 80724.0876380774. The cubic root of 6516378325 is about 1867.8217580672.

The spelling of 6516378325 in words is "six billion, five hundred sixteen million, three hundred seventy-eight thousand, three hundred twenty-five".