664655796 has 144 divisors (see below), whose sum is σ = 2063152000. Its totient is φ = 179843328.

The previous prime is 664655767. The next prime is 664655833. The reversal of 664655796 is 697556466.

664655796 is a `hidden beast` number, since 6 + 6 + 4 + 65 + 579 + 6 = 666.

It is a congruent 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 47 ways as a sum of consecutive naturals, for example, 233196 + ... + 236028.

Almost surely, 2^664655796 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 664655796, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1031576000).

664655796 is an abundant number, since it is smaller than the sum of its proper divisors (1398496204).

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

664655796 is a wasteful number, since it uses less digits than its factorization.

664655796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2883 (or 2864 counting only the distinct ones).

The product of its digits is 8164800, while the sum is 54.

The square root of 664655796 is about 25780.9192233326. The cubic root of 664655796 is about 872.7012514850.

The spelling of 664655796 in words is "six hundred sixty-four million, six hundred fifty-five thousand, seven hundred ninety-six".