6516507647 has 4 divisors (see below), whose sum is σ = 7017777480. Its totient is φ = 6015237816.

The previous prime is 6516507601. The next prime is 6516507649. The reversal of 6516507647 is 7467056156.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6516507647 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 (6516507649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250634897 + ... + 250634922.

It is an arithmetic number, because the mean of its divisors is an integer number (1754444370).

Almost surely, 2^6516507647 is an apocalyptic number.

6516507647 is a deficient number, since it is larger than the sum of its proper divisors (501269833).

6516507647 is a wasteful number, since it uses less digits than its factorization.

6516507647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501269832.

The product of its (nonzero) digits is 1058400, while the sum is 47.

The square root of 6516507647 is about 80724.8886465630. Note that the first 3 decimals coincide. The cubic root of 6516507647 is about 1867.8341140537.

The spelling of 6516507647 in words is "six billion, five hundred sixteen million, five hundred seven thousand, six hundred forty-seven".