66686023 has 2 divisors, whose sum is σ = 66686024. Its totient is φ = 66686022.

The previous prime is 66686021. The next prime is 66686027. The reversal of 66686023 is 32068666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66686023 - 2¹ = 66686021 is a prime.

Together with 66686021, it forms a pair of twin primes.

It is equal to p_3934387 and since 66686023 and 3934387 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66686021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33343011 + 33343012.

It is an arithmetic number, because the mean of its divisors is an integer number (33343012).

Almost surely, 2^66686023 is an apocalyptic number.

66686023 is a deficient number, since it is larger than the sum of its proper divisors (1).

66686023 is an equidigital number, since it uses as much as digits as its factorization.

66686023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 66686023 is about 8166.1510517501. The cubic root of 66686023 is about 405.5193722839.

The spelling of 66686023 in words is "sixty-six million, six hundred eighty-six thousand, twenty-three".