6564520642 has 8 divisors (see below), whose sum is σ = 9971424000. Its totient is φ = 3240712644.

The previous prime is 6564520637. The next prime is 6564520657. The reversal of 6564520642 is 2460254656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 6564520595 and 6564520604.

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, 20773642 + ... + 20773957.

It is an arithmetic number, because the mean of its divisors is an integer number (1246428000).

Almost surely, 2^6564520642 is an apocalyptic number.

6564520642 is a deficient number, since it is larger than the sum of its proper divisors (3406903358).

6564520642 is a wasteful number, since it uses less digits than its factorization.

6564520642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41547680.

The product of its (nonzero) digits is 345600, while the sum is 40.

The square root of 6564520642 is about 81021.7294434030. The cubic root of 6564520642 is about 1872.4102336583.

The spelling of 6564520642 in words is "six billion, five hundred sixty-four million, five hundred twenty thousand, six hundred forty-two".