666065442 has 64 divisors (see below), whose sum is σ = 1608228864. Its totient is φ = 179867520.

The previous prime is 666065431. The next prime is 666065447. The reversal of 666065442 is 244560666.

666065442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 666065442.

It is not an unprimeable number, because it can be changed into a prime (666065447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50038 + ... + 61934.

It is an arithmetic number, because the mean of its divisors is an integer number (25128576).

Almost surely, 2^666065442 is an apocalyptic number.

666065442 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 666065442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (804114432).

666065442 is an abundant number, since it is smaller than the sum of its proper divisors (942163422).

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

666065442 is a wasteful number, since it uses less digits than its factorization.

666065442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11983.

The product of its (nonzero) digits is 207360, while the sum is 39.

The square root of 666065442 is about 25808.2436829785. The cubic root of 666065442 is about 873.3177766913.

The spelling of 666065442 in words is "six hundred sixty-six million, sixty-five thousand, four hundred forty-two".