66423703 has 4 divisors (see below), whose sum is σ = 66464280. Its totient is φ = 66383128.

The previous prime is 66423689. The next prime is 66423719. The reversal of 66423703 is 30732466.

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 66423703 - 2⁵ = 66423671 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 (66420703) 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, 17725 + ... + 21142.

It is an arithmetic number, because the mean of its divisors is an integer number (16616070).

Almost surely, 2^66423703 is an apocalyptic number.

66423703 is a deficient number, since it is larger than the sum of its proper divisors (40577).

66423703 is a wasteful number, since it uses less digits than its factorization.

66423703 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40576.

The product of its (nonzero) digits is 18144, while the sum is 31.

The square root of 66423703 is about 8150.0738033468. The cubic root of 66423703 is about 404.9869487234.

The spelling of 66423703 in words is "sixty-six million, four hundred twenty-three thousand, seven hundred three".