66649085 has 4 divisors (see below), whose sum is σ = 79978908. Its totient is φ = 53319264.

The previous prime is 66649069. The next prime is 66649103. The reversal of 66649085 is 58094666.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 53260804 + 13388281 = 7298^2 + 3659^2 .

It is a cyclic number.

It is not a de Polignac number, because 66649085 - 2⁴ = 66649069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6664904 + ... + 6664913.

It is an arithmetic number, because the mean of its divisors is an integer number (19994727).

Almost surely, 2^66649085 is an apocalyptic number.

It is an amenable number.

66649085 is a deficient number, since it is larger than the sum of its proper divisors (13329823).

66649085 is a wasteful number, since it uses less digits than its factorization.

66649085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13329822.

The product of its (nonzero) digits is 311040, while the sum is 44.

The square root of 66649085 is about 8163.8890854788. The cubic root of 66649085 is about 405.4444848216. Note that the first 4 decimals are identical.

The spelling of 66649085 in words is "sixty-six million, six hundred forty-nine thousand, eighty-five".