665606001 has 8 divisors (see below), whose sum is σ = 887715520. Its totient is φ = 443616912.

The previous prime is 665605979. The next prime is 665606009. The reversal of 665606001 is 100606566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 665606001 - 2⁷ = 665605873 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 665606001.

It is not an unprimeable number, because it can be changed into a prime (665606009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16306 + ... + 39963.

It is an arithmetic number, because the mean of its divisors is an integer number (110964440).

Almost surely, 2^665606001 is an apocalyptic number.

It is an amenable number.

665606001 is a deficient number, since it is larger than the sum of its proper divisors (222109519).

665606001 is a wasteful number, since it uses less digits than its factorization.

665606001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60215.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 665606001 is about 25799.3410962373. The cubic root of 665606001 is about 873.1169304188.

The spelling of 665606001 in words is "six hundred sixty-five million, six hundred six thousand, one".