664656616 has 128 divisors (see below), whose sum is σ = 1497000960. Its totient is φ = 273715200.

The previous prime is 664656611. The next prime is 664656649. The reversal of 664656616 is 616656466.

It is not an unprimeable number, because it can be changed into a prime (664656611) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3672046 + ... + 3672226.

It is an arithmetic number, because the mean of its divisors is an integer number (11695320).

Almost surely, 2^664656616 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 664656616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (748500480).

664656616 is an abundant number, since it is smaller than the sum of its proper divisors (832344344).

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

664656616 is a wasteful number, since it uses less digits than its factorization.

664656616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315 (or 311 counting only the distinct ones).

The product of its digits is 933120, while the sum is 46.

The square root of 664656616 is about 25780.9351265620. The cubic root of 664656616 is about 872.7016103749.

The spelling of 664656616 in words is "six hundred sixty-four million, six hundred fifty-six thousand, six hundred sixteen".