66086639 has 2 divisors, whose sum is σ = 66086640. Its totient is φ = 66086638.

The previous prime is 66086627. The next prime is 66086641. The reversal of 66086639 is 93668066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66086639 - 2²⁴ = 49309423 is a prime.

Together with 66086641, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66086639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66086039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33043319 + 33043320.

It is an arithmetic number, because the mean of its divisors is an integer number (33043320).

Almost surely, 2^66086639 is an apocalyptic number.

66086639 is a deficient number, since it is larger than the sum of its proper divisors (1).

66086639 is an equidigital number, since it uses as much as digits as its factorization.

66086639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 44.

The square root of 66086639 is about 8129.3689176959. The cubic root of 66086639 is about 404.3007575671.

The spelling of 66086639 in words is "sixty-six million, eighty-six thousand, six hundred thirty-nine".