6564640194 has 64 divisors (see below), whose sum is σ = 16900558080. Its totient is φ = 1849910400.

The previous prime is 6564640189. The next prime is 6564640237. The reversal of 6564640194 is 4910464656.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91357 + ... + 146544.

It is an arithmetic number, because the mean of its divisors is an integer number (264071220).

Almost surely, 2^6564640194 is an apocalyptic number.

6564640194 is an abundant number, since it is smaller than the sum of its proper divisors (10335917886).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6564640194 is a wasteful number, since it uses less digits than its factorization.

6564640194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237992 (or 237986 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The square root of 6564640194 is about 81022.4672174330. The cubic root of 6564640194 is about 1872.4216002678.

The spelling of 6564640194 in words is "six billion, five hundred sixty-four million, six hundred forty thousand, one hundred ninety-four".