666705012 has 48 divisors (see below), whose sum is σ = 1611926400. Its totient is φ = 214220160.

The previous prime is 666705001. The next prime is 666705019. The reversal of 666705012 is 210507666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666705019) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 287337 + ... + 289647.

It is an arithmetic number, because the mean of its divisors is an integer number (33581800).

Almost surely, 2^666705012 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666705012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (805963200).

666705012 is an abundant number, since it is smaller than the sum of its proper divisors (945221388).

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

666705012 is a wasteful number, since it uses less digits than its factorization.

666705012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3176 (or 3174 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 666705012 is about 25820.6315182259. The cubic root of 666705012 is about 873.5972132822.

The spelling of 666705012 in words is "six hundred sixty-six million, seven hundred five thousand, twelve".