666620059776 has 256 divisors, whose sum is σ = 2098950451200. Its totient is φ = 185200128000.

The previous prime is 666620059723. The next prime is 666620059799. The reversal of 666620059776 is 677950026666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2353966 + ... + 2621906.

It is an arithmetic number, because the mean of its divisors is an integer number (8199025200).

Almost surely, 2^666620059776 is an apocalyptic number.

666620059776 is a gapful number since it is divisible by the number (66) 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 666620059776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1049475225600).

666620059776 is an abundant number, since it is smaller than the sum of its proper divisors (1432330391424).

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

666620059776 is a wasteful number, since it uses less digits than its factorization.

666620059776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268019 (or 268007 counting only the distinct ones).

The product of its (nonzero) digits is 34292160, while the sum is 60.

The spelling of 666620059776 in words is "six hundred sixty-six billion, six hundred twenty million, fifty-nine thousand, seven hundred seventy-six".