666243724343540 has 192 divisors, whose sum is σ = 1707548561510400. Its totient is φ = 213513331691520.

The previous prime is 666243724343531. The next prime is 666243724343579. The reversal of 666243724343540 is 45343427342666.

It is a self number, because there is not a number n which added to its sum of digits gives 666243724343540.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6857186 + ... + 37141734.

It is an arithmetic number, because the mean of its divisors is an integer number (8893482091200).

Almost surely, 2^{666243724343540} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666243724343540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (853774280755200).

666243724343540 is an abundant number, since it is smaller than the sum of its proper divisors (1041304837166860).

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

666243724343540 is a wasteful number, since it uses less digits than its factorization.

666243724343540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30284770 (or 30284768 counting only the distinct ones).

The product of its (nonzero) digits is 209018880, while the sum is 59.

The spelling of 666243724343540 in words is "six hundred sixty-six trillion, two hundred forty-three billion, seven hundred twenty-four million, three hundred forty-three thousand, five hundred forty".