664943552 has 224 divisors, whose sum is σ = 1747845120. Its totient is φ = 243855360.

The previous prime is 664943533. The next prime is 664943557. The reversal of 664943552 is 255349466.

It is a tau number, because it is divible by the number of its divisors (224).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664943557) 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, 5235713 + ... + 5235839.

It is an arithmetic number, because the mean of its divisors is an integer number (7802880).

Almost surely, 2^664943552 is an apocalyptic number.

664943552 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664943552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (873922560).

664943552 is an abundant number, since it is smaller than the sum of its proper divisors (1082901568).

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

664943552 is a wasteful number, since it uses less digits than its factorization.

664943552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219 (or 209 counting only the distinct ones).

The product of its digits is 777600, while the sum is 44.

The square root of 664943552 is about 25786.4994134528. The cubic root of 664943552 is about 872.8271757057.

The spelling of 664943552 in words is "six hundred sixty-four million, nine hundred forty-three thousand, five hundred fifty-two".