666599508417480 has 256 divisors, whose sum is σ = 2208073793587200. Its totient is φ = 159648056709120.

The previous prime is 666599508417467. The next prime is 666599508417487. The reversal of 666599508417480 is 84714805995666.

It is a super-3 number, since 3×666599508417480³ (a number of 45 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 666599508417396 and 666599508417405.

It is not an unprimeable number, because it can be changed into a prime (666599508417487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 38513581 + ... + 53070659.

It is an arithmetic number, because the mean of its divisors is an integer number (8625288256200).

Almost surely, 2^{666599508417480} is an apocalyptic number.

666599508417480 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 666599508417480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1104036896793600).

666599508417480 is an abundant number, since it is smaller than the sum of its proper divisors (1541474285169720).

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

666599508417480 is a wasteful number, since it uses less digits than its factorization.

666599508417480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14557524 (or 14557520 counting only the distinct ones).

The product of its (nonzero) digits is 3135283200, while the sum is 78.

The spelling of 666599508417480 in words is "six hundred sixty-six trillion, five hundred ninety-nine billion, five hundred eight million, four hundred seventeen thousand, four hundred eighty".