66606600 has 96 divisors (see below), whose sum is σ = 213200640. Its totient is φ = 17184000.

The previous prime is 66606599. The next prime is 66606601. The reversal of 66606600 is 660666.

It is an interprime number because it is at equal distance from previous prime (66606599) and next prime (66606601).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (66606601) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16810 + ... + 20390.

It is an arithmetic number, because the mean of its divisors is an integer number (2220840).

Almost surely, 2^66606600 is an apocalyptic number.

66606600 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 66606600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106600320).

66606600 is an abundant number, since it is smaller than the sum of its proper divisors (146594040).

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

66606600 is a wasteful number, since it uses less digits than its factorization.

66606600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3631 (or 3622 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 66606600 is about 8161.2866632658. The cubic root of 66606600 is about 405.3583172456.

The spelling of 66606600 in words is "sixty-six million, six hundred six thousand, six hundred".