665343663600 has 480 divisors, whose sum is σ = 2660745701376. Its totient is φ = 138070195200.

The previous prime is 665343663587. The next prime is 665343663613. The reversal of 665343663600 is 6366343566.

It is an interprime number because it is at equal distance from previous prime (665343663587) and next prime (665343663613).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 665343663600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 76410447 + ... + 76419153.

Almost surely, 2^665343663600 is an apocalyptic number.

665343663600 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 665343663600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1330372850688).

665343663600 is an abundant number, since it is smaller than the sum of its proper divisors (1995402037776).

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

665343663600 is a wasteful number, since it uses less digits than its factorization.

665343663600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9573 (or 9562 counting only the distinct ones).

The product of its (nonzero) digits is 4199040, while the sum is 48.

The spelling of 665343663600 in words is "six hundred sixty-five billion, three hundred forty-three million, six hundred sixty-three thousand, six hundred".