66000505 has 4 divisors (see below), whose sum is σ = 79200612. Its totient is φ = 52800400.

The previous prime is 66000499. The next prime is 66000523. The reversal of 66000505 is 50500066.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50500066 = 2 ⋅25250033.

It can be written as a sum of positive squares in 2 ways, for example, as 10169721 + 55830784 = 3189^2 + 7472^2 .

It is not a de Polignac number, because 66000505 - 2³ = 66000497 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, 6600046 + ... + 6600055.

It is an arithmetic number, because the mean of its divisors is an integer number (19800153).

Almost surely, 2^66000505 is an apocalyptic number.

It is an amenable number.

66000505 is a deficient number, since it is larger than the sum of its proper divisors (13200107).

66000505 is a wasteful number, since it uses less digits than its factorization.

66000505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13200106.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 66000505 is about 8124.0694851780. The cubic root of 66000505 is about 404.1250327799.

The spelling of 66000505 in words is "sixty-six million, five hundred five", and thus it is an aban number.