665567003440 has 20 divisors (see below), whose sum is σ = 1547443283184. Its totient is φ = 266226801344.

The previous prime is 665567003407. The next prime is 665567003503. The reversal of 665567003440 is 44300765566.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4159793692 + ... + 4159793851.

Almost surely, 2^665567003440 is an apocalyptic number.

It is an amenable number.

665567003440 is an abundant number, since it is smaller than the sum of its proper divisors (881876279744).

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

665567003440 is a wasteful number, since it uses less digits than its factorization.

665567003440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8319587556 (or 8319587550 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 46.

The spelling of 665567003440 in words is "six hundred sixty-five billion, five hundred sixty-seven million, three thousand, four hundred forty".