665005444 has 24 divisors (see below), whose sum is σ = 1195867008. Its totient is φ = 323416800.

The previous prime is 665005441. The next prime is 665005447. The reversal of 665005444 is 444500566.

It is an interprime number because it is at equal distance from previous prime (665005441) and next prime (665005447).

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (665005441) 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, 19794 + ... + 41494.

It is an arithmetic number, because the mean of its divisors is an integer number (49827792).

Almost surely, 2^665005444 is an apocalyptic number.

It is an amenable number.

665005444 is a deficient number, since it is larger than the sum of its proper divisors (530861564).

665005444 is a wasteful number, since it uses less digits than its factorization.

665005444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21915 (or 21913 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 34.

The square root of 665005444 is about 25787.6994708718. The cubic root of 665005444 is about 872.8542553695.

The spelling of 665005444 in words is "six hundred sixty-five million, five thousand, four hundred forty-four".