66223838 has 4 divisors (see below), whose sum is σ = 99335760. Its totient is φ = 33111918.

The previous prime is 66223819. The next prime is 66223841. The reversal of 66223838 is 83832266.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16555958 + ... + 16555961.

It is an arithmetic number, because the mean of its divisors is an integer number (24833940).

Almost surely, 2^66223838 is an apocalyptic number.

66223838 is a deficient number, since it is larger than the sum of its proper divisors (33111922).

66223838 is a wasteful number, since it uses less digits than its factorization.

66223838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33111921.

The product of its digits is 82944, while the sum is 38.

The square root of 66223838 is about 8137.8030204718. The cubic root of 66223838 is about 404.5803466984.

The spelling of 66223838 in words is "sixty-six million, two hundred twenty-three thousand, eight hundred thirty-eight".