664566446 has 4 divisors (see below), whose sum is σ = 996849672. Its totient is φ = 332283222.

The previous prime is 664566443. The next prime is 664566451. The reversal of 664566446 is 644665466.

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

It is a super-2 number, since 2×664566446² = 883297122298141832, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 664566446.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664566443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166141610 + ... + 166141613.

It is an arithmetic number, because the mean of its divisors is an integer number (249212418).

Almost surely, 2^664566446 is an apocalyptic number.

664566446 is a deficient number, since it is larger than the sum of its proper divisors (332283226).

664566446 is a wasteful number, since it uses less digits than its factorization.

664566446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332283225.

The product of its digits is 2488320, while the sum is 47.

The square root of 664566446 is about 25779.1862943732. The cubic root of 664566446 is about 872.6621438489.

The spelling of 664566446 in words is "six hundred sixty-four million, five hundred sixty-six thousand, four hundred forty-six".