666506130 has 128 divisors (see below), whose sum is σ = 1773100800. Its totient is φ = 159667200.

The previous prime is 666506041. The next prime is 666506189. The reversal of 666506130 is 31605666.

666506130 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 666506091 and 666506100.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1008000 + ... + 1008660.

It is an arithmetic number, because the mean of its divisors is an integer number (13852350).

Almost surely, 2^666506130 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666506130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (886550400).

666506130 is an abundant number, since it is smaller than the sum of its proper divisors (1106594670).

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

666506130 is a wasteful number, since it uses less digits than its factorization.

666506130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780.

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 666506130 is about 25816.7800083589. The cubic root of 666506130 is about 873.5103382591.

The spelling of 666506130 in words is "six hundred sixty-six million, five hundred six thousand, one hundred thirty".