656066609 has 32 divisors (see below), whose sum is σ = 765186048. Its totient is φ = 556920000.

The previous prime is 656066597. The next prime is 656066617. The reversal of 656066609 is 906660656.

It is a cyclic number.

It is not a de Polignac number, because 656066609 - 2⁸ = 656066353 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 656066609.

It is not an unprimeable number, because it can be changed into a prime (656066699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1480742 + ... + 1481184.

It is an arithmetic number, because the mean of its divisors is an integer number (23912064).

Almost surely, 2^656066609 is an apocalyptic number.

It is an amenable number.

656066609 is a deficient number, since it is larger than the sum of its proper divisors (109119439).

656066609 is a wasteful number, since it uses less digits than its factorization.

656066609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629.

The product of its (nonzero) digits is 349920, while the sum is 44.

The square root of 656066609 is about 25613.7972389882. The cubic root of 656066609 is about 868.9257048543.

The spelling of 656066609 in words is "six hundred fifty-six million, sixty-six thousand, six hundred nine".