666854580480 has 864 divisors, whose sum is σ = 2456115400704. Its totient is φ = 153888768000.

The previous prime is 666854580421. The next prime is 666854580487. The reversal of 666854580480 is 84085458666.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is not an unprimeable number, because it can be changed into a prime (666854580487) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 965056935 + ... + 965057625.

Almost surely, 2^666854580480 is an apocalyptic number.

666854580480 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 666854580480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1228057700352).

666854580480 is an abundant number, since it is smaller than the sum of its proper divisors (1789260820224).

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

666854580480 is a wasteful number, since it uses less digits than its factorization.

666854580480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835 (or 810 counting only the distinct ones).

The product of its (nonzero) digits is 44236800, while the sum is 60.

The spelling of 666854580480 in words is "six hundred sixty-six billion, eight hundred fifty-four million, five hundred eighty thousand, four hundred eighty".