6566820394 has 16 divisors (see below), whose sum is σ = 10493592480. Its totient is φ = 3073120560.

The previous prime is 6566820341. The next prime is 6566820433. The reversal of 6566820394 is 4930286656.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1037877 + ... + 1044184.

It is an arithmetic number, because the mean of its divisors is an integer number (655849530).

Almost surely, 2^6566820394 is an apocalyptic number.

6566820394 is a deficient number, since it is larger than the sum of its proper divisors (3926772086).

6566820394 is a wasteful number, since it uses less digits than its factorization.

6566820394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2082165.

The product of its (nonzero) digits is 1866240, while the sum is 49.

The square root of 6566820394 is about 81035.9203933663. The cubic root of 6566820394 is about 1872.6288622864.

The spelling of 6566820394 in words is "six billion, five hundred sixty-six million, eight hundred twenty thousand, three hundred ninety-four".