66485515 has 4 divisors (see below), whose sum is σ = 79782624. Its totient is φ = 53188408.

The previous prime is 66485501. The next prime is 66485533. The reversal of 66485515 is 51558466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51558466 = 2 ⋅25779233.

It is a cyclic number.

It is not a de Polignac number, because 66485515 - 2¹¹ = 66483467 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 6648547 + ... + 6648556.

It is an arithmetic number, because the mean of its divisors is an integer number (19945656).

Almost surely, 2^66485515 is an apocalyptic number.

66485515 is a deficient number, since it is larger than the sum of its proper divisors (13297109).

66485515 is a wasteful number, since it uses less digits than its factorization.

66485515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13297108.

The product of its digits is 144000, while the sum is 40.

The square root of 66485515 is about 8153.8650344484. The cubic root of 66485515 is about 405.1125328705.

The spelling of 66485515 in words is "sixty-six million, four hundred eighty-five thousand, five hundred fifteen".