665522653824 has 1152 divisors, whose sum is σ = 2490698995200. Its totient is φ = 169305292800.

The previous prime is 665522653819. The next prime is 665522653847. The reversal of 665522653824 is 428356225566.

665522653824 is a `hidden beast` number, since 6 + 6 + 5 + 522 + 65 + 38 + 24 = 666.

It is a tau number, because it is divible by the number of its divisors (1152).

Its product of digits (20736000) is a multiple of the sum of its prime divisors (640).

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 143 ways as a sum of consecutive naturals, for example, 1230170994 + ... + 1230171534.

It is an arithmetic number, because the mean of its divisors is an integer number (2162065100).

Almost surely, 2^665522653824 is an apocalyptic number.

665522653824 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665522653824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1245349497600).

665522653824 is an abundant number, since it is smaller than the sum of its proper divisors (1825176341376).

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

665522653824 is a wasteful number, since it uses less digits than its factorization.

665522653824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662 (or 640 counting only the distinct ones).

The product of its digits is 20736000, while the sum is 54.

The spelling of 665522653824 in words is "six hundred sixty-five billion, five hundred twenty-two million, six hundred fifty-three thousand, eight hundred twenty-four".