665013888000 has 3520 divisors, whose sum is σ = 3338424460800. Its totient is φ = 130056192000.

The previous prime is 665013887999. The next prime is 665013888041. The reversal of 665013888000 is 888310566.

665013888000 is a `hidden beast` number, since 66 + 501 + 3 + 8 + 8 + 80 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (3520).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 319 ways as a sum of consecutive naturals, for example, 39118463992 + ... + 39118464008.

It is an arithmetic number, because the mean of its divisors is an integer number (948416040).

Almost surely, 2^665013888000 is an apocalyptic number.

665013888000 is a gapful number since it is divisible by the number (60) 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 665013888000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1669212230400).

665013888000 is an abundant number, since it is smaller than the sum of its proper divisors (2673410572800).

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

665013888000 is a wasteful number, since it uses less digits than its factorization.

665013888000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96 (or 45 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 665013888000 in words is "six hundred sixty-five billion, thirteen million, eight hundred eighty-eight thousand".