664676657 has 16 divisors (see below), whose sum is σ = 688191552. Its totient is φ = 641659200.

The previous prime is 664676651. The next prime is 664676711. The reversal of 664676657 is 756676466.

It is a happy number.

664676657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 664676657 - 2⁴ = 664676641 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664676599 and 664676608.

It is not an unprimeable number, because it can be changed into a prime (664676651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1214858 + ... + 1215404.

It is an arithmetic number, because the mean of its divisors is an integer number (43011972).

Almost surely, 2^664676657 is an apocalyptic number.

It is an amenable number.

664676657 is a deficient number, since it is larger than the sum of its proper divisors (23514895).

664676657 is a wasteful number, since it uses less digits than its factorization.

664676657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 928.

The product of its digits is 7620480, while the sum is 53.

The square root of 664676657 is about 25781.3238023186. The cubic root of 664676657 is about 872.7103816396.

The spelling of 664676657 in words is "six hundred sixty-four million, six hundred seventy-six thousand, six hundred fifty-seven".