66696686 has 32 divisors (see below), whose sum is σ = 118720512. Its totient is φ = 27499680.

The previous prime is 66696683. The next prime is 66696703. The reversal of 66696686 is 68669666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66696683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98180 + ... + 98856.

It is an arithmetic number, because the mean of its divisors is an integer number (3710016).

Almost surely, 2^66696686 is an apocalyptic number.

66696686 is a deficient number, since it is larger than the sum of its proper divisors (52023826).

66696686 is a wasteful number, since it uses less digits than its factorization.

66696686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 944.

The product of its digits is 3359232, while the sum is 53.

The square root of 66696686 is about 8166.8039036088. The cubic root of 66696686 is about 405.5409851218.

The spelling of 66696686 in words is "sixty-six million, six hundred ninety-six thousand, six hundred eighty-six".