664343663 has 12 divisors (see below), whose sum is σ = 715683312. Its totient is φ = 616439040.

The previous prime is 664343657. The next prime is 664343699. The reversal of 664343663 is 366343466.

It is a happy number.

It is not a de Polignac number, because 664343663 - 2¹⁶ = 664278127 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 664343663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664343653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4331 + ... + 36707.

It is an arithmetic number, because the mean of its divisors is an integer number (59640276).

Almost surely, 2^664343663 is an apocalyptic number.

664343663 is a deficient number, since it is larger than the sum of its proper divisors (51339649).

664343663 is a wasteful number, since it uses less digits than its factorization.

664343663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32482 (or 32465 counting only the distinct ones).

The product of its digits is 559872, while the sum is 41.

The square root of 664343663 is about 25774.8649462999. The cubic root of 664343663 is about 872.5646186026.

The spelling of 664343663 in words is "six hundred sixty-four million, three hundred forty-three thousand, six hundred sixty-three".