66541509485 has 16 divisors (see below), whose sum is σ = 87332843520. Its totient is φ = 48269403840.

The previous prime is 66541509457. The next prime is 66541509521. The reversal of 66541509485 is 58490514566.

It is not a de Polignac number, because 66541509485 - 2⁶ = 66541509421 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1533677 + ... + 1576466.

It is an arithmetic number, because the mean of its divisors is an integer number (5458302720).

Almost surely, 2^66541509485 is an apocalyptic number.

It is an amenable number.

66541509485 is a deficient number, since it is larger than the sum of its proper divisors (20791334035).

66541509485 is a wasteful number, since it uses less digits than its factorization.

66541509485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3110548.

The product of its (nonzero) digits is 5184000, while the sum is 53.

The spelling of 66541509485 in words is "sixty-six billion, five hundred forty-one million, five hundred nine thousand, four hundred eighty-five".