664747466 has 4 divisors (see below), whose sum is σ = 997121202. Its totient is φ = 332373732.

The previous prime is 664747463. The next prime is 664747529.

664747466 is nontrivially palindromic in base 10.

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

It can be written as a sum of positive squares in only one way, i.e., 452200225 + 212547241 = 21265^2 + 14579^2 .

It is not an unprimeable number, because it can be changed into a prime (664747463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166186865 + ... + 166186868.

Almost surely, 2^664747466 is an apocalyptic number.

664747466 is a deficient number, since it is larger than the sum of its proper divisors (332373736).

664747466 is a wasteful number, since it uses less digits than its factorization.

664747466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332373735.

The product of its digits is 4064256, while the sum is 50.

The square root of 664747466 is about 25782.6970272701. The cubic root of 664747466 is about 872.7413709206.

The spelling of 664747466 in words is "six hundred sixty-four million, seven hundred forty-seven thousand, four hundred sixty-six".