66910686 has 8 divisors (see below), whose sum is σ = 133821384. Its totient is φ = 22303560.

The previous prime is 66910643. The next prime is 66910687. The reversal of 66910686 is 68601966.

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

66910686 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66910687) 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, 5575885 + ... + 5575896.

It is an arithmetic number, because the mean of its divisors is an integer number (16727673).

Almost surely, 2^66910686 is an apocalyptic number.

66910686 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.

66910686 is a wasteful number, since it uses less digits than its factorization.

66910686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11151786.

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 66910686 is about 8179.8952316029. The cubic root of 66910686 is about 405.9742556091.

The spelling of 66910686 in words is "sixty-six million, nine hundred ten thousand, six hundred eighty-six".