665067820536 has 72 divisors (see below), whose sum is σ = 2095302966120. Its totient is φ = 190019376288.

The previous prime is 665067820523. The next prime is 665067820559. The reversal of 665067820536 is 635028760566.

It is a happy number.

665067820536 is a `hidden beast` number, since 6 + 6 + 506 + 7 + 82 + 0 + 53 + 6 = 666.

665067820536 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 94252116 + ... + 94259171.

It is an arithmetic number, because the mean of its divisors is an integer number (29101430085).

Almost surely, 2^665067820536 is an apocalyptic number.

It is an amenable number.

665067820536 is an abundant number, since it is smaller than the sum of its proper divisors (1430235145584).

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

665067820536 is a wasteful number, since it uses less digits than its factorization.

665067820536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188511313 (or 188511299 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 54.

The spelling of 665067820536 in words is "six hundred sixty-five billion, sixty-seven million, eight hundred twenty thousand, five hundred thirty-six".