664564834 has 16 divisors (see below), whose sum is σ = 1008754560. Its totient is φ = 328335280.

The previous prime is 664564793. The next prime is 664564837. The reversal of 664564834 is 438465466.

664564834 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (664564837) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57312 + ... + 67924.

It is an arithmetic number, because the mean of its divisors is an integer number (63047160).

Almost surely, 2^664564834 is an apocalyptic number.

664564834 is a deficient number, since it is larger than the sum of its proper divisors (344189726).

664564834 is a wasteful number, since it uses less digits than its factorization.

664564834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10985.

The product of its digits is 1658880, while the sum is 46.

The square root of 664564834 is about 25779.1550288213. The cubic root of 664564834 is about 872.6614382598.

The spelling of 664564834 in words is "six hundred sixty-four million, five hundred sixty-four thousand, eight hundred thirty-four".