666320346 has 96 divisors (see below), whose sum is σ = 1549342080. Its totient is φ = 206623872.

The previous prime is 666320323. The next prime is 666320357. The reversal of 666320346 is 643023666.

666320346 is a modest number, since divided by 320346 gives 666 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 666320346.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1517595 + ... + 1518033.

It is an arithmetic number, because the mean of its divisors is an integer number (16138980).

Almost surely, 2^666320346 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666320346, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (774671040).

666320346 is an abundant number, since it is smaller than the sum of its proper divisors (883021734).

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

666320346 is a wasteful number, since it uses less digits than its factorization.

666320346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580 (or 577 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 36.

The square root of 666320346 is about 25813.1816326465. The cubic root of 666320346 is about 873.4291690504.

It can be divided in two parts, 666320 and 346, that added together give a palindrome (666666).

The spelling of 666320346 in words is "six hundred sixty-six million, three hundred twenty thousand, three hundred forty-six".