665301640 has 32 divisors (see below), whose sum is σ = 1500871680. Its totient is φ = 265419712.

The previous prime is 665301631. The next prime is 665301649. The reversal of 665301640 is 46103566.

665301640 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 (665301631) and next prime (665301649).

It is not an unprimeable number, because it can be changed into a prime (665301649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6394 + ... + 37033.

It is an arithmetic number, because the mean of its divisors is an integer number (46902240).

Almost surely, 2^665301640 is an apocalyptic number.

It is an amenable number.

665301640 is an abundant number, since it is smaller than the sum of its proper divisors (835570040).

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

665301640 is a wasteful number, since it uses less digits than its factorization.

665301640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43821 (or 43817 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 665301640 is about 25793.4418021326. The cubic root of 665301640 is about 872.9838270227.

The spelling of 665301640 in words is "six hundred sixty-five million, three hundred one thousand, six hundred forty".