66740085 has 32 divisors (see below), whose sum is σ = 121418880. Its totient is φ = 34763904.

The previous prime is 66740077. The next prime is 66740099. The reversal of 66740085 is 58004766.

It is a happy number.

It is not a de Polignac number, because 66740085 - 2³ = 66740077 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57 + ... + 11553.

It is an arithmetic number, because the mean of its divisors is an integer number (3794340).

Almost surely, 2^66740085 is an apocalyptic number.

It is an amenable number.

66740085 is a deficient number, since it is larger than the sum of its proper divisors (54678795).

66740085 is a wasteful number, since it uses less digits than its factorization.

66740085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11554 (or 11548 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 66740085 is about 8169.4605085036. The cubic root of 66740085 is about 405.6289268085.

The spelling of 66740085 in words is "sixty-six million, seven hundred forty thousand, eighty-five".