66780908 has 12 divisors (see below), whose sum is σ = 116923800. Its totient is φ = 33374112.

The previous prime is 66780907. The next prime is 66780929. The reversal of 66780908 is 80908766.

It is not an unprimeable number, because it can be changed into a prime (66780907) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14243 + ... + 18341.

It is an arithmetic number, because the mean of its divisors is an integer number (9743650).

Almost surely, 2^66780908 is an apocalyptic number.

It is an amenable number.

66780908 is a deficient number, since it is larger than the sum of its proper divisors (50142892).

66780908 is a wasteful number, since it uses less digits than its factorization.

66780908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8176 (or 8174 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 66780908 is about 8171.9586391513. The cubic root of 66780908 is about 405.7116138204.

The spelling of 66780908 in words is "sixty-six million, seven hundred eighty thousand, nine hundred eight".