6564487915 has 4 divisors (see below), whose sum is σ = 7877385504. Its totient is φ = 5251590328.

The previous prime is 6564487907. The next prime is 6564487931. The reversal of 6564487915 is 5197844656.

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

It is a cyclic number.

It is not a de Polignac number, because 6564487915 - 2³ = 6564487907 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 656448787 + ... + 656448796.

It is an arithmetic number, because the mean of its divisors is an integer number (1969346376).

Almost surely, 2^6564487915 is an apocalyptic number.

6564487915 is a deficient number, since it is larger than the sum of its proper divisors (1312897589).

6564487915 is a wasteful number, since it uses less digits than its factorization.

6564487915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1312897588.

The product of its digits is 7257600, while the sum is 55.

The square root of 6564487915 is about 81021.5274788127. The cubic root of 6564487915 is about 1872.4071220591.

The spelling of 6564487915 in words is "six billion, five hundred sixty-four million, four hundred eighty-seven thousand, nine hundred fifteen".