66423785 has 8 divisors (see below), whose sum is σ = 79752840. Its totient is φ = 53109504.

The previous prime is 66423767. The next prime is 66423817. The reversal of 66423785 is 58732466.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 50176 + 66373609 = 224^2 + 8147^2 .

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 66423785 - 2¹⁰ = 66422761 is a prime.

It is an unprimeable number.

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, 13409 + ... + 17681.

It is an arithmetic number, because the mean of its divisors is an integer number (9969105).

Almost surely, 2^66423785 is an apocalyptic number.

It is an amenable number.

66423785 is a deficient number, since it is larger than the sum of its proper divisors (13329055).

66423785 is a wasteful number, since it uses less digits than its factorization.

66423785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7387.

The product of its digits is 241920, while the sum is 41.

The square root of 66423785 is about 8150.0788339746. The cubic root of 66423785 is about 404.9871153753.

The spelling of 66423785 in words is "sixty-six million, four hundred twenty-three thousand, seven hundred eighty-five".