6566949487 has 18 divisors (see below), whose sum is σ = 7601622504. Its totient is φ = 5557325760.

The previous prime is 6566949479. The next prime is 6566949527. The reversal of 6566949487 is 7849496656.

It is a happy number.

It is not a de Polignac number, because 6566949487 - 2³ = 6566949479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6566940487) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 23369787 + ... + 23370067.

Almost surely, 2^6566949487 is an apocalyptic number.

6566949487 is a deficient number, since it is larger than the sum of its proper divisors (1034673017).

6566949487 is an frugal number, since it uses more digits than its factorization.

6566949487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 787 (or 397 counting only the distinct ones).

The product of its digits is 78382080, while the sum is 64.

The square root of 6566949487 is about 81036.7169065973. The cubic root of 6566949487 is about 1872.6411331511.

The spelling of 6566949487 in words is "six billion, five hundred sixty-six million, nine hundred forty-nine thousand, four hundred eighty-seven".