666069601680 has 480 divisors, whose sum is σ = 2591930105856. Its totient is φ = 150137680896.

The previous prime is 666069601649. The next prime is 666069601709. The reversal of 666069601680 is 86106960666.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 310810689 + ... + 310812831.

Almost surely, 2^666069601680 is an apocalyptic number.

666069601680 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 666069601680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1295965052928).

666069601680 is an abundant number, since it is smaller than the sum of its proper divisors (1925860504176).

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

666069601680 is a wasteful number, since it uses less digits than its factorization.

666069601680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2995 (or 2986 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 54.

The spelling of 666069601680 in words is "six hundred sixty-six billion, sixty-nine million, six hundred one thousand, six hundred eighty".