66338263 has 4 divisors (see below), whose sum is σ = 66635968. Its totient is φ = 66040560.

The previous prime is 66338249. The next prime is 66338339. The reversal of 66338263 is 36283366.

It is a happy number.

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 66338263 - 2⁹ = 66337751 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66338963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148518 + ... + 148963.

It is an arithmetic number, because the mean of its divisors is an integer number (16658992).

Almost surely, 2^66338263 is an apocalyptic number.

66338263 is a deficient number, since it is larger than the sum of its proper divisors (297705).

66338263 is a wasteful number, since it uses less digits than its factorization.

66338263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297704.

The product of its digits is 93312, while the sum is 37.

The square root of 66338263 is about 8144.8304463629. The cubic root of 66338263 is about 404.8132309588.

The spelling of 66338263 in words is "sixty-six million, three hundred thirty-eight thousand, two hundred sixty-three".