66808545 has 8 divisors (see below), whose sum is σ = 106893696. Its totient is φ = 35631216.

The previous prime is 66808531. The next prime is 66808561. The reversal of 66808545 is 54580866.

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

It is not a de Polignac number, because 66808545 - 2¹² = 66804449 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66808497 and 66808506.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 2226937 + ... + 2226966.

It is an arithmetic number, because the mean of its divisors is an integer number (13361712).

Almost surely, 2^66808545 is an apocalyptic number.

It is an amenable number.

66808545 is a deficient number, since it is larger than the sum of its proper divisors (40085151).

66808545 is a wasteful number, since it uses less digits than its factorization.

66808545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4453911.

The product of its (nonzero) digits is 230400, while the sum is 42.

The square root of 66808545 is about 8173.6494297223. The cubic root of 66808545 is about 405.7675734541.

It can be divided in two parts, 6680 and 8545, that added together give a triangular number (15225 = T₁₇₄).

The spelling of 66808545 in words is "sixty-six million, eight hundred eight thousand, five hundred forty-five".