66248863 has 4 divisors (see below), whose sum is σ = 67237720. Its totient is φ = 65260008.

The previous prime is 66248851. The next prime is 66248869. The reversal of 66248863 is 36884266.

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 66248863 - 2¹⁷ = 66117791 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 (66248869) 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, 494328 + ... + 494461.

It is an arithmetic number, because the mean of its divisors is an integer number (16809430).

Almost surely, 2^66248863 is an apocalyptic number.

66248863 is a deficient number, since it is larger than the sum of its proper divisors (988857).

66248863 is an equidigital number, since it uses as much as digits as its factorization.

66248863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 988856.

The product of its digits is 331776, while the sum is 43.

The square root of 66248863 is about 8139.3404523954. The cubic root of 66248863 is about 404.6313019054.

The spelling of 66248863 in words is "sixty-six million, two hundred forty-eight thousand, eight hundred sixty-three".