66423407 has 4 divisors (see below), whose sum is σ = 66708720. Its totient is φ = 66138096.

The previous prime is 66423397. The next prime is 66423463. The reversal of 66423407 is 70432466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66423407 - 2¹⁶ = 66357871 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 (66420407) 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 3 ways as a sum of consecutive naturals, for example, 142307 + ... + 142772.

It is an arithmetic number, because the mean of its divisors is an integer number (16677180).

Almost surely, 2^66423407 is an apocalyptic number.

66423407 is a deficient number, since it is larger than the sum of its proper divisors (285313).

66423407 is a wasteful number, since it uses less digits than its factorization.

66423407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285312.

The product of its (nonzero) digits is 24192, while the sum is 32.

The square root of 66423407 is about 8150.0556439818. The cubic root of 66423407 is about 404.9863471494.

The spelling of 66423407 in words is "sixty-six million, four hundred twenty-three thousand, four hundred seven".