664651536 has 80 divisors (see below), whose sum is σ = 1742346816. Its totient is φ = 218308608.

The previous prime is 664651529. The next prime is 664651543. The reversal of 664651536 is 635156466.

664651536 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (664651529) and next prime (664651543).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1534776 + ... + 1535208.

Almost surely, 2^664651536 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 664651536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (871173408).

664651536 is an abundant number, since it is smaller than the sum of its proper divisors (1077695280).

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

664651536 is a wasteful number, since it uses less digits than its factorization.

664651536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840 (or 834 counting only the distinct ones).

The product of its digits is 388800, while the sum is 42.

The square root of 664651536 is about 25780.8366039584. The cubic root of 664651536 is about 872.6993870036.

The spelling of 664651536 in words is "six hundred sixty-four million, six hundred fifty-one thousand, five hundred thirty-six".