66858407 has 8 divisors (see below), whose sum is σ = 83356032. Its totient is φ = 52097400.

The previous prime is 66858377. The next prime is 66858419. The reversal of 66858407 is 70485866.

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

It is a cyclic number.

It is not a de Polignac number, because 66858407 - 2⁶ = 66858343 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 (66858457) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 434069 + ... + 434222.

It is an arithmetic number, because the mean of its divisors is an integer number (10419504).

Almost surely, 2^66858407 is an apocalyptic number.

66858407 is a deficient number, since it is larger than the sum of its proper divisors (16497625).

66858407 is a wasteful number, since it uses less digits than its factorization.

66858407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868309.

The product of its (nonzero) digits is 322560, while the sum is 44.

The square root of 66858407 is about 8176.6990283366. The cubic root of 66858407 is about 405.8684954315.

The spelling of 66858407 in words is "sixty-six million, eight hundred fifty-eight thousand, four hundred seven".