663709243680 has 672 divisors, whose sum is σ = 2698100544384. Its totient is φ = 151066902528.

The previous prime is 663709243667. The next prime is 663709243733. The reversal of 663709243680 is 86342907366.

663709243680 is a `hidden beast` number, since 6 + 63 + 70 + 9 + 2 + 436 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (672).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 209833779 + ... + 209836941.

It is an arithmetic number, because the mean of its divisors is an integer number (4015030572).

Almost surely, 2^663709243680 is an apocalyptic number.

663709243680 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 663709243680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1349050272192).

663709243680 is an abundant number, since it is smaller than the sum of its proper divisors (2034391300704).

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

663709243680 is a wasteful number, since it uses less digits than its factorization.

663709243680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3460 (or 3437 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 54.

The spelling of 663709243680 in words is "six hundred sixty-three billion, seven hundred nine million, two hundred forty-three thousand, six hundred eighty".