665042056 has 64 divisors (see below), whose sum is σ = 1495169280. Its totient is φ = 271138560.

The previous prime is 665042029. The next prime is 665042071. The reversal of 665042056 is 650240566.

665042056 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 252426 + ... + 255046.

It is an arithmetic number, because the mean of its divisors is an integer number (23362020).

Almost surely, 2^665042056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665042056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (747584640).

665042056 is an abundant number, since it is smaller than the sum of its proper divisors (830127224).

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

665042056 is a wasteful number, since it uses less digits than its factorization.

665042056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2854 (or 2850 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 665042056 is about 25788.4093344277. The cubic root of 665042056 is about 872.8702734607.

The spelling of 665042056 in words is "six hundred sixty-five million, forty-two thousand, fifty-six".