664686476 has 24 divisors (see below), whose sum is σ = 1216664064. Its totient is φ = 317137040.

The previous prime is 664686437. The next prime is 664686479. The reversal of 664686476 is 674686466.

It is a super-2 number, since 2×664686476² = 883616222754597152, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (664686479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31271 + ... + 48033.

It is an arithmetic number, because the mean of its divisors is an integer number (50694336).

Almost surely, 2^664686476 is an apocalyptic number.

It is an amenable number.

664686476 is a deficient number, since it is larger than the sum of its proper divisors (551977588).

664686476 is a wasteful number, since it uses less digits than its factorization.

664686476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17221 (or 17219 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 53.

The square root of 664686476 is about 25781.5142301611. The cubic root of 664686476 is about 872.7146790178.

The spelling of 664686476 in words is "six hundred sixty-four million, six hundred eighty-six thousand, four hundred seventy-six".