666667700 has 72 divisors (see below), whose sum is σ = 1489717152. Its totient is φ = 258814080.

The previous prime is 666667691. The next prime is 666667717. The reversal of 666667700 is 7766666.

It is a zygodrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 846707 + ... + 847493.

It is an arithmetic number, because the mean of its divisors is an integer number (20690516).

Almost surely, 2^666667700 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 666667700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (744858576).

666667700 is an abundant number, since it is smaller than the sum of its proper divisors (823049452).

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

666667700 is a wasteful number, since it uses less digits than its factorization.

666667700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1041 (or 1034 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 44.

The square root of 666667700 is about 25819.9089851223. The cubic root of 666667700 is about 873.5809160860.

The spelling of 666667700 in words is "six hundred sixty-six million, six hundred sixty-seven thousand, seven hundred".