664676566 has 4 divisors (see below), whose sum is σ = 997014852. Its totient is φ = 332338282.

The previous prime is 664676531. The next prime is 664676581. The reversal of 664676566 is 665676466.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166169140 + ... + 166169143.

It is an arithmetic number, because the mean of its divisors is an integer number (249253713).

Almost surely, 2^664676566 is an apocalyptic number.

664676566 is a deficient number, since it is larger than the sum of its proper divisors (332338286).

664676566 is a wasteful number, since it uses less digits than its factorization.

664676566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332338285.

The product of its digits is 6531840, while the sum is 52.

The square root of 664676566 is about 25781.3220374751. The cubic root of 664676566 is about 872.7103418124.

The spelling of 664676566 in words is "six hundred sixty-four million, six hundred seventy-six thousand, five hundred sixty-six".