66861708 has 12 divisors (see below), whose sum is σ = 156010680. Its totient is φ = 22287232.

The previous prime is 66861677. The next prime is 66861727. The reversal of 66861708 is 80716866.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 66861708.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2785893 + ... + 2785916.

It is an arithmetic number, because the mean of its divisors is an integer number (13000890).

Almost surely, 2^66861708 is an apocalyptic number.

It is an amenable number.

66861708 is an abundant number, since it is smaller than the sum of its proper divisors (89148972).

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

66861708 is a wasteful number, since it uses less digits than its factorization.

66861708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5571816 (or 5571814 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 66861708 is about 8176.9008799178. The cubic root of 66861708 is about 405.8751749697.

The spelling of 66861708 in words is "sixty-six million, eight hundred sixty-one thousand, seven hundred eight".