665606064 has 20 divisors (see below), whose sum is σ = 1719482456. Its totient is φ = 221868672.

The previous prime is 665606033. The next prime is 665606069. The reversal of 665606064 is 460606566.

It is not an unprimeable number, because it can be changed into a prime (665606069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6933349 + ... + 6933444.

Almost surely, 2^665606064 is an apocalyptic number.

It is an amenable number.

665606064 is an abundant number, since it is smaller than the sum of its proper divisors (1053876392).

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

665606064 is a wasteful number, since it uses less digits than its factorization.

665606064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13866804 (or 13866798 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 39.

The square root of 665606064 is about 25799.3423171987. The cubic root of 665606064 is about 873.1169579658.

The spelling of 665606064 in words is "six hundred sixty-five million, six hundred six thousand, sixty-four".