66682680 has 64 divisors (see below), whose sum is σ = 204716160. Its totient is φ = 17367168.

The previous prime is 66682669. The next prime is 66682697. The reversal of 66682680 is 8628666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1302 + ... + 11621.

It is an arithmetic number, because the mean of its divisors is an integer number (3198690).

Almost surely, 2^66682680 is an apocalyptic number.

66682680 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 66682680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102358080).

66682680 is an abundant number, since it is smaller than the sum of its proper divisors (138033480).

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

66682680 is a wasteful number, since it uses less digits than its factorization.

66682680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12980 (or 12976 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 66682680 is about 8165.9463627923. The cubic root of 66682680 is about 405.5125958818.

The spelling of 66682680 in words is "sixty-six million, six hundred eighty-two thousand, six hundred eighty".