66814445 has 8 divisors (see below), whose sum is σ = 80223000. Its totient is φ = 53421120.

The previous prime is 66814439. The next prime is 66814453. The reversal of 66814445 is 54441866.

It can be written as a sum of positive squares in 4 ways, for example, as 8031556 + 58782889 = 2834^2 + 7667^2 .

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

It is not a de Polignac number, because 66814445 - 2¹² = 66810349 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66814399 and 66814408.

It is a congruent number.

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, 11315 + ... + 16175.

It is an arithmetic number, because the mean of its divisors is an integer number (10027875).

Almost surely, 2^66814445 is an apocalyptic number.

It is an amenable number.

66814445 is a deficient number, since it is larger than the sum of its proper divisors (13408555).

66814445 is a wasteful number, since it uses less digits than its factorization.

66814445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7615.

The product of its digits is 92160, while the sum is 38.

The square root of 66814445 is about 8174.0103376494. The cubic root of 66814445 is about 405.7795178255.

The spelling of 66814445 in words is "sixty-six million, eight hundred fourteen thousand, four hundred forty-five".