664986318 has 16 divisors (see below), whose sum is σ = 1337938560. Its totient is φ = 220334456.

The previous prime is 664986307. The next prime is 664986319. The reversal of 664986318 is 813689466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664986319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 330828 + ... + 332831.

It is an arithmetic number, because the mean of its divisors is an integer number (83621160).

Almost surely, 2^664986318 is an apocalyptic number.

664986318 is an abundant number, since it is smaller than the sum of its proper divisors (672952242).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664986318 is a wasteful number, since it uses less digits than its factorization.

664986318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663831.

The product of its digits is 1492992, while the sum is 51.

The square root of 664986318 is about 25787.3286324893. The cubic root of 664986318 is about 872.8458873325.

The spelling of 664986318 in words is "six hundred sixty-four million, nine hundred eighty-six thousand, three hundred eighteen".