667608545 has 16 divisors (see below), whose sum is σ = 809040960. Its totient is φ = 528840000.

The previous prime is 667608523. The next prime is 667608559. The reversal of 667608545 is 545806766.

It is a de Polignac number, because none of the positive numbers 2^k-667608545 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 667608545.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 225686 + ... + 228624.

It is an arithmetic number, because the mean of its divisors is an integer number (50565060).

Almost surely, 2^667608545 is an apocalyptic number.

It is an amenable number.

667608545 is a deficient number, since it is larger than the sum of its proper divisors (141432415).

667608545 is a wasteful number, since it uses less digits than its factorization.

667608545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3376.

The product of its (nonzero) digits is 1209600, while the sum is 47.

The square root of 667608545 is about 25838.1219325244. The cubic root of 667608545 is about 873.9916743984.

The spelling of 667608545 in words is "six hundred sixty-seven million, six hundred eight thousand, five hundred forty-five".