6537221866 has 16 divisors (see below), whose sum is σ = 11242707840. Its totient is φ = 2792656080.

The previous prime is 6537221857. The next prime is 6537222001. The reversal of 6537221866 is 6681227356.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 746361 + ... + 755068.

It is an arithmetic number, because the mean of its divisors is an integer number (702669240).

Almost surely, 2^6537221866 is an apocalyptic number.

6537221866 is a deficient number, since it is larger than the sum of its proper divisors (4705485974).

6537221866 is a wasteful number, since it uses less digits than its factorization.

6537221866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1501749.

The product of its digits is 725760, while the sum is 46.

The square root of 6537221866 is about 80853.0881661301. The cubic root of 6537221866 is about 1869.8111342328.

The spelling of 6537221866 in words is "six billion, five hundred thirty-seven million, two hundred twenty-one thousand, eight hundred sixty-six".