66690085 has 32 divisors (see below), whose sum is σ = 101025792. Its totient is φ = 41052480.

The previous prime is 66690073. The next prime is 66690089. The reversal of 66690085 is 58009666.

It is not a de Polignac number, because 66690085 - 2⁷ = 66689957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66690089) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30912 + ... + 32998.

It is an arithmetic number, because the mean of its divisors is an integer number (3157056).

Almost surely, 2^66690085 is an apocalyptic number.

It is an amenable number.

66690085 is a deficient number, since it is larger than the sum of its proper divisors (34335707).

66690085 is a wasteful number, since it uses less digits than its factorization.

66690085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2193.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 66690085 is about 8166.3997575431. The cubic root of 66690085 is about 405.5276058246.

The spelling of 66690085 in words is "sixty-six million, six hundred ninety thousand, eighty-five".