666017958060 has 768 divisors, whose sum is σ = 2771160268800. Its totient is φ = 128826547200.

The previous prime is 666017958049. The next prime is 666017958077. The reversal of 666017958060 is 60859710666.

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

It is a junction number, because it is equal to n+sod(n) for n = 666017957988 and 666017958006.

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 255 ways as a sum of consecutive naturals, for example, 28931955 + ... + 28954965.

It is an arithmetic number, because the mean of its divisors is an integer number (3608281600).

Almost surely, 2^666017958060 is an apocalyptic number.

666017958060 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 666017958060, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1385580134400).

666017958060 is an abundant number, since it is smaller than the sum of its proper divisors (2105142310740).

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

666017958060 is a wasteful number, since it uses less digits than its factorization.

666017958060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23099 (or 23091 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The spelling of 666017958060 in words is "six hundred sixty-six billion, seventeen million, nine hundred fifty-eight thousand, sixty".