6548947666 has 16 divisors (see below), whose sum is σ = 9929081880. Its totient is φ = 3239308800.

The previous prime is 6548947651. The next prime is 6548947679. The reversal of 6548947666 is 6667498456.

It can be written as a sum of positive squares in 4 ways, for example, as 6541412641 + 7535025 = 80879^2 + 2745^2 .

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 7 ways as a sum of consecutive naturals, for example, 236770 + ... + 262978.

Almost surely, 2^6548947666 is an apocalyptic number.

6548947666 is a deficient number, since it is larger than the sum of its proper divisors (3380134214).

6548947666 is a wasteful number, since it uses less digits than its factorization.

6548947666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27549.

The product of its digits is 52254720, while the sum is 61.

The square root of 6548947666 is about 80925.5686788792. The cubic root of 6548947666 is about 1870.9284251318.

The spelling of 6548947666 in words is "six billion, five hundred forty-eight million, nine hundred forty-seven thousand, six hundred sixty-six".