665385822 has 24 divisors (see below), whose sum is σ = 1443340080. Its totient is φ = 221538240.

The previous prime is 665385779. The next prime is 665385823. The reversal of 665385822 is 228583566.

665385822 is a `hidden beast` number, since 6 + 65 + 3 + 8 + 582 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665385823) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 5122 + ... + 36837.

It is an arithmetic number, because the mean of its divisors is an integer number (60139170).

Almost surely, 2^665385822 is an apocalyptic number.

665385822 is an abundant number, since it is smaller than the sum of its proper divisors (777954258).

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

665385822 is a wasteful number, since it uses less digits than its factorization.

665385822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42848 (or 42845 counting only the distinct ones).

The product of its digits is 691200, while the sum is 45.

The square root of 665385822 is about 25795.0735994298. The cubic root of 665385822 is about 873.0206456228.

The spelling of 665385822 in words is "six hundred sixty-five million, three hundred eighty-five thousand, eight hundred twenty-two".