660243803520 has 256 divisors, whose sum is σ = 2421109601280. Its totient is φ = 149912985600.

The previous prime is 660243803467. The next prime is 660243803627. The reversal of 660243803520 is 25308342066.

It is a happy number.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 1866774 + ... + 2192106.

It is an arithmetic number, because the mean of its divisors is an integer number (9457459380).

Almost surely, 2^660243803520 is an apocalyptic number.

660243803520 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 660243803520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1210554800640).

660243803520 is an abundant number, since it is smaller than the sum of its proper divisors (1760865797760).

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

660243803520 is a wasteful number, since it uses less digits than its factorization.

660243803520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325513 (or 325501 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 39.

The spelling of 660243803520 in words is "six hundred sixty billion, two hundred forty-three million, eight hundred three thousand, five hundred twenty".