664779066 has 32 divisors (see below), whose sum is σ = 1568514048. Its totient is φ = 183809520.

The previous prime is 664779047. The next prime is 664779077. The reversal of 664779066 is 660977466.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 253990 + ... + 256593.

It is an arithmetic number, because the mean of its divisors is an integer number (49016064).

Almost surely, 2^664779066 is an apocalyptic number.

664779066 is an abundant number, since it is smaller than the sum of its proper divisors (903734982).

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

664779066 is a wasteful number, since it uses less digits than its factorization.

664779066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510626.

The product of its (nonzero) digits is 2286144, while the sum is 51.

The square root of 664779066 is about 25783.3098340768. The cubic root of 664779066 is about 872.7551998264.

The spelling of 664779066 in words is "six hundred sixty-four million, seven hundred seventy-nine thousand, sixty-six".