66666966 has 8 divisors (see below), whose sum is σ = 133333944. Its totient is φ = 22222320.

The previous prime is 66666937. The next prime is 66666973. The reversal of 66666966 is 66966666.

It is a sphenic number, since it is the product of 3 distinct primes.

66666966 is an admirable number.

It is a Curzon number.

It is a congruent number.

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, 5555575 + ... + 5555586.

It is an arithmetic number, because the mean of its divisors is an integer number (16666743).

Almost surely, 2^66666966 is an apocalyptic number.

66666966 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66666966 is a wasteful number, since it uses less digits than its factorization.

66666966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11111166.

The product of its digits is 2519424, while the sum is 51.

The square root of 66666966 is about 8164.9841396049. The cubic root of 66666966 is about 405.4807399059.

The spelling of 66666966 in words is "sixty-six million, six hundred sixty-six thousand, nine hundred sixty-six".