666640602 has 96 divisors (see below), whose sum is σ = 1546646400. Its totient is φ = 207081600.

The previous prime is 666640577. The next prime is 666640609. The reversal of 666640602 is 206046666.

666640602 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (666640609) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4474024 + ... + 4474172.

It is an arithmetic number, because the mean of its divisors is an integer number (16110900).

Almost surely, 2^666640602 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666640602, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (773323200).

666640602 is an abundant number, since it is smaller than the sum of its proper divisors (880005798).

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

666640602 is a wasteful number, since it uses less digits than its factorization.

666640602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388 (or 385 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 666640602 is about 25819.3842296829. The cubic root of 666640602 is about 873.5690797961.

The spelling of 666640602 in words is "six hundred sixty-six million, six hundred forty thousand, six hundred two".