664563361 has 16 divisors (see below), whose sum is σ = 872156160. Its totient is φ = 490585680.

The previous prime is 664563359. The next prime is 664563373. The reversal of 664563361 is 163365466.

It is a cyclic number.

It is not a de Polignac number, because 664563361 - 2¹ = 664563359 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664563061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 225661 + ... + 228586.

It is an arithmetic number, because the mean of its divisors is an integer number (54509760).

Almost surely, 2^664563361 is an apocalyptic number.

It is an amenable number.

664563361 is a deficient number, since it is larger than the sum of its proper divisors (207592799).

664563361 is a wasteful number, since it uses less digits than its factorization.

664563361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454284.

The product of its digits is 233280, while the sum is 40.

The square root of 664563361 is about 25779.1264592111. The cubic root of 664563361 is about 872.6607935114.

The spelling of 664563361 in words is "six hundred sixty-four million, five hundred sixty-three thousand, three hundred sixty-one".