66808535 has 8 divisors (see below), whose sum is σ = 80246160. Its totient is φ = 53396224.

The previous prime is 66808531. The next prime is 66808561. The reversal of 66808535 is 53580866.

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

It is a cyclic number.

It is not a de Polignac number, because 66808535 - 2² = 66808531 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66808492 and 66808501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66808531) 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 7 ways as a sum of consecutive naturals, for example, 71 + ... + 11559.

It is an arithmetic number, because the mean of its divisors is an integer number (10030770).

Almost surely, 2^66808535 is an apocalyptic number.

66808535 is a deficient number, since it is larger than the sum of its proper divisors (13437625).

66808535 is a wasteful number, since it uses less digits than its factorization.

66808535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12657.

The product of its (nonzero) digits is 172800, while the sum is 41.

The square root of 66808535 is about 8173.6488180004. The cubic root of 66808535 is about 405.7675532088.

The spelling of 66808535 in words is "sixty-six million, eight hundred eight thousand, five hundred thirty-five".