664110656 has 56 divisors (see below), whose sum is σ = 1455968640. Its totient is φ = 298022400.

The previous prime is 664110649. The next prime is 664110659. The reversal of 664110656 is 656011466.

It is not an unprimeable number, because it can be changed into a prime (664110659) 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, 49646 + ... + 61586.

It is an arithmetic number, because the mean of its divisors is an integer number (25999440).

Almost surely, 2^664110656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664110656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (727984320).

664110656 is an abundant number, since it is smaller than the sum of its proper divisors (791857984).

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

664110656 is a wasteful number, since it uses less digits than its factorization.

664110656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12043 (or 12033 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 664110656 is about 25770.3445068164. The cubic root of 664110656 is about 872.4625943794.

The spelling of 664110656 in words is "six hundred sixty-four million, one hundred ten thousand, six hundred fifty-six".