66680860 has 24 divisors (see below), whose sum is σ = 144859680. Its totient is φ = 25752384.

The previous prime is 66680821. The next prime is 66680863. The reversal of 66680860 is 6808666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66680863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56904 + ... + 58063.

It is an arithmetic number, because the mean of its divisors is an integer number (6035820).

Almost surely, 2^66680860 is an apocalyptic number.

It is an amenable number.

66680860 is an abundant number, since it is smaller than the sum of its proper divisors (78178820).

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

66680860 is a wasteful number, since it uses less digits than its factorization.

66680860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115005 (or 115003 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 66680860 is about 8165.8349236315. The cubic root of 66680860 is about 405.5089065698.

It can be divided in two parts, 6 and 6680860, that added together give a palindrome (6680866).

The spelling of 66680860 in words is "sixty-six million, six hundred eighty thousand, eight hundred sixty".