66858685 has 8 divisors (see below), whose sum is σ = 80674776. Its totient is φ = 53190720.

The previous prime is 66858683. The next prime is 66858689. The reversal of 66858685 is 58685866.

It can be written as a sum of positive squares in 4 ways, for example, as 3034564 + 63824121 = 1742^2 + 7989^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66858685 - 2¹ = 66858683 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66858683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36034 + ... + 37843.

It is an arithmetic number, because the mean of its divisors is an integer number (10084347).

Almost surely, 2^66858685 is an apocalyptic number.

It is an amenable number.

66858685 is a deficient number, since it is larger than the sum of its proper divisors (13816091).

66858685 is a wasteful number, since it uses less digits than its factorization.

66858685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74063.

The product of its digits is 2764800, while the sum is 52.

The square root of 66858685 is about 8176.7160278439. The cubic root of 66858685 is about 405.8690579700.

The spelling of 66858685 in words is "sixty-six million, eight hundred fifty-eight thousand, six hundred eighty-five".